05-Network Connectivity

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13-NAT commands
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Contents

NAT commands· 1

address· 2

address interface· 3

block-size· 4

display nat address-group· 5

display nat alg· 7

display nat all 8

display nat dns-map· 20

display nat eim·· 22

display nat inbound· 23

display nat log· 25

display nat no-pat 26

display nat outbound· 27

display nat outbound port-block-group· 30

display nat port-block· 31

display nat port-block-group· 32

display nat port-block-usage· 34

display nat server 36

display nat server-group· 38

display nat session· 39

display nat static· 42

display nat statistics· 45

global-ip-pool 47

inside ip· 48

local-ip-address· 49

nat address-group· 50

nat alg· 50

nat dns-map· 52

nat icmp-error reply· 53

nat inbound· 53

nat inbound rule move· 56

nat log alarm·· 56

nat log enable· 57

nat log flow-active· 58

nat log flow-begin· 59

nat log flow-end· 59

nat log port-block usage threshold· 60

nat log port-block-assign· 61

nat log port-block-withdraw· 61

nat mapping-behavior endpoint-independent 62

nat outbound· 63

nat outbound port-block-group· 66

nat outbound rule move· 67

nat port-block global-share enable· 68

nat port-block-group· 68

nat server 69

nat server rule move· 74

nat server-group· 75

nat static enable· 76

nat static inbound· 76

nat static inbound net-to-net 78

nat static inbound rule move· 80

nat static outbound· 81

nat static outbound net-to-net 82

nat static outbound rule move· 84

nat timestamp delete· 85

port-block· 86

port-range· 87

reset nat count statistics· 88

reset nat session· 88


NAT commands

The WX1800H series, WX2500H series, and WX3000H series access controllers do not support parameters or commands that are available only in IRF mode.

The following compatibility matrixes show the support of hardware platforms for NAT:

 

Hardware series

Model

Product code

NAT compatibility

WX1800H series

WX1804H

EWP-WX1804H-PWR-CN

Yes

WX2500H series

WX2508H-PWR-LTE

WX2510H

WX2510H-F

WX2540H

WX2540H-F

WX2560H

EWP-WX2508H-PWR-LTE

EWP-WX2510H-PWR

EWP-WX2510H-F-PWR

EWP-WX2540H

EWP-WX2540H-F

EWP-WX2560H

Yes

WX3000H series

WX3010H

WX3010H-X

WX3010H-L

WX3024H

WX3024H-L

WX3024H-F

EWP-WX3010H

EWP-WX3010H-X-PWR

EWP-WX3010H-L-PWR

EWP-WX3024H

EWP-WX3024H-L-PWR

EWP-WX3024H-F

Yes:

·     WX3010H

·     WX3010H-X

·     WX3024H

·     WX3024H-F

No:

·     WX3010H-L

·     WX3024H-L

WX3500H series

WX3508H

WX3510H

WX3520H

WX3520H-F

WX3540H

EWP-WX3508H

EWP-WX3510H

EWP-WX3520H

EWP-WX3520H-F

EWP-WX3540H

Yes

WX5500E series

WX5510E

WX5540E

EWP-WX5510E

EWP-WX5540E

Yes

WX5500H series

WX5540H

WX5560H

WX5580H

EWP-WX5540H

EWP-WX5560H

EWP-WX5580H

Yes

Access controller modules

LSUM1WCME0

EWPXM1WCME0

LSQM1WCMX20

LSUM1WCMX20RT

LSQM1WCMX40 LSUM1WCMX40RT

EWPXM2WCMD0F

EWPXM1MAC0F

LSUM1WCME0

EWPXM1WCME0

LSQM1WCMX20

LSUM1WCMX20RT

LSQM1WCMX40

LSUM1WCMX40RT

EWPXM2WCMD0F

EWPXM1MAC0F

Yes

Hardware series

Model

Product code

NAT compatibility

WX1800H series

WX1804H

WX1810H

WX1820H

WX1840H

EWP-WX1804H-PWR

EWP-WX1810H-PWR

EWP-WX1820H

EWP-WX1840H-GL

Yes

WX3800H series

WX3820H

WX3840H

EWP-WX3820H-GL

EWP-WX3840H-GL

Yes

WX5800H series

WX5860H

EWP-WX5860H-GL

Yes

address

Use address to add an address range to a NAT address group.

Use undo address to remove an address range from a NAT address group.

Syntax

address start-address end-address

undo address start-address end-address

Default

No address ranges exist.

Views

NAT address group view

Predefined user roles

network-admin

Parameters

start-address end-address: Specifies the start and end IP addresses of the address range. The end address must not be lower than the start address. If they are the same, the address range has only one IP address. You can specify a maximum of 65535 addresses in an IP address range.

Usage guidelines

A NAT address group is a set of address ranges. The source address in a packet destined for an external network is translated into an address in one of the address ranges.

Make sure the address ranges in a single NAT address group or in multiple NAT address groups do not overlap.

The address command and the address interface command are mutually exclusive for one NAT address group. Support for the address interface command varies by device model. For the command matrixes, see the address interface command.

Examples

# Add address ranges to an address group.

<Sysname> system-view

[Sysname] nat address-group 2

[Sysname-address-group-2] address 10.1.1.1 10.1.1.15

[Sysname-address-group-2] address 10.1.1.20 10.1.1.30

Related commands

address interface

nat address-group

address interface

Use address interface to add the IP address of an interface to a NAT address group.

Use undo address interface to restore the default.

Syntax

address interface interface-type interface-number

undo address interface

The following compatibility matrixes show the support of hardware platforms for this command:

 

Hardware series

Model

Product code

Command compatibility

WX1800H series

WX1804H

EWP-WX1804H-PWR-CN

Yes

WX2500H series

WX2508H-PWR-LTE

WX2510H

WX2510H-F

WX2540H

WX2540H-F

WX2560H

EWP-WX2508H-PWR-LTE

EWP-WX2510H-PWR

EWP-WX2510H-F-PWR

EWP-WX2540H

EWP-WX2540H-F

EWP-WX2560H

Yes:

·     WX2508H-PWR-LTE

·     WX2510H

No:

·     WX2510H-F

·     WX2540H

·     WX2540H-F

·     WX2560H

WX3000H series

WX3010H

WX3010H-X

WX3010H-L

WX3024H

WX3024H-L

WX3024H-F

EWP-WX3010H

EWP-WX3010H-X-PWR

EWP-WX3010H-L-PWR

EWP-WX3024H

EWP-WX3024H-L-PWR

EWP-WX3024H-F

No

WX3500H series

WX3508H

WX3510H

WX3520H

WX3520H-F

WX3540H

EWP-WX3508H

EWP-WX3510H

EWP-WX3520H

EWP-WX3520H-F

EWP-WX3540H

No

WX5500E series

WX5510E

WX5540E

EWP-WX5510E

EWP-WX5540E

No

WX5500H series

WX5540H

WX5560H

WX5580H

EWP-WX5540H

EWP-WX5560H

EWP-WX5580H

No

Access controller modules

LSUM1WCME0

EWPXM1WCME0

LSQM1WCMX20

LSUM1WCMX20RT

LSQM1WCMX40 LSUM1WCMX40RT

EWPXM2WCMD0F

EWPXM1MAC0F

LSUM1WCME0

EWPXM1WCME0

LSQM1WCMX20

LSUM1WCMX20RT

LSQM1WCMX40

LSUM1WCMX40RT

EWPXM2WCMD0F

EWPXM1MAC0F

No

Hardware series

Model

Product code

Command compatibility

WX1800H series

WX1804H

WX1810H

WX1820H

WX1840H

EWP-WX1804H-PWR

EWP-WX1810H-PWR

EWP-WX1820H

EWP-WX1840H-GL

Yes

WX3800H series

WX3820H

WX3840H

EWP-WX3820H-GL

EWP-WX3840H-GL

No

WX5800H series

WX5860H

EWP-WX5860H-GL

No

Default

No interface address exists in a NAT address group.

Views

NAT address group view

Predefines user roles

network-admin

Parameters

interface-type interface-number: Specifies an interface by its type and number.

Usage guidelines

This command is applicable to EasyIP with the IP address of the NAT interface dynamically obtained through DHCP or PPPoE. After you configure this command, the primary IPv4 address of the specified interface will be added to the NAT address group.

You can specify only one interface for a NAT address group.

The address command and the address interface command are mutually exclusive for one NAT address group.

The IP address of an interface cannot be added to different NAT address groups.

Make sure addresses in different NAT address groups do not overlap.

Examples

# Add the IP address of VLAN-interface 20 to NAT address group 2.

<Sysname> system-view

[Sysname] nat address-group 2

[Sysname-address-group-2] address interface vlan-interface20

Related commands

address

nat address-group

block-size

Use block-size to set the port block size.

Use undo block-size to restore the default.

Syntax

block-size block-size

undo block-size

Default

The port block size is 256.

Views

NAT port block group view

Predefined user roles

network-admin

Parameters

block-size: Specifies the number of ports for a port block. The value range for this argument is 1 to 65535.

Usage guidelines

Set an appropriate port block size based on the number of private IP addresses, the number of public IP addresses, and the port range in the port block group.

The port block size cannot be larger than the number of ports in the port range.

Examples

# Set the port block size to 1024 for port block group 1.

<Sysname> system-view

[Sysname] nat port-block-group 1

[Sysname-port-block-group-1] block-size 1024

Related commands

nat port-block-group

display nat address-group

Use display nat address-group to display NAT address group information.

Syntax

display nat address-group [ group-id ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

group-id: Specifies the ID of a NAT address group. The value range for this argument is 0 to 65535. If you do not specify the group-id argument, this command displays information about all NAT address groups.

Examples

# Display information about all NAT address groups.

<Sysname> display nat address-group

NAT address group information:

  Totally 5 NAT address groups.

  Address group ID: 1    Address group name: a

    Port range: 1-65535

    Address information:

      Start address         End address

      202.110.10.10         202.110.10.15

 

  Address group ID: 2

    Port range: 1-65535

    Address information:

      Start address         End address

      202.110.10.20         202.110.10.25

      202.110.10.30         202.110.10.35

 

  Address group ID: 3

    Port range: 1024-65535

    Address information:

      Start address         End address

      202.110.10.40         202.110.10.50

 

  Address group ID: 4

    Port range: 10001-65535

    Port block size: 500

    Extended block number: 1

    Address information:

      Start address         End address

      202.110.10.60         202.110.10.65

 

  Address group ID: 6

    Port range: 1-65535

    Address information:

      Start address         End address

      ---                   ---

# Display information about NAT address group 1.

<Sysname> display nat address-group 1

  Address group ID: 1    Address group name: a

    Port range: 1-65535

    Address information:

      Start address         End address

      202.110.10.10         202.110.10.15

Table 1 Command output

Field

Description

NAT address group information

Information about the NAT address group

Address group ID

ID of the NAT address group.

Totally n NAT address groups

Total number of NAT address groups.

Address group name

Name of the NAT address group. If no address group name is configured, this field is not displayed.

Port range

Port range for public IP addresses.

Port block size

Number of ports in a port block. This field is not displayed if the port block size is not set.

Extended block number

Number of extended port blocks. This field is not displayed if the number of extended port blocks is not set.

Address information

Information about the IP addresses in the address group.

·     For addresses added by using the address command:

¡     Start address—Start IP address of an address range. If you do not specify a start address for the range, this field displays hyphens (---).

¡     End address—End IP address of an address range. If you do not specify an end address for the range, this field displays hyphens (---).

·     For addresses added by using the address interface command:

¡     20.1.1.1 (Vlan-interface10)—IP address 20.1.1.1 of VLAN-interface10 has been added to the NAT address group.

¡     --- (Vlan-interface10)—Failed to add the IP address of VLAN-interface10 to the NAT address group because this interface does not have an IP address.

Related commands

nat address-group

display nat alg

Use display nat alg to display the NAT ALG status for all supported protocols.

Syntax

display nat alg

Views

Any view

Predefined user roles

network-admin

network-operator

Examples

# Display the NAT ALG status for all supported protocols.

<Sysname> display nat alg

NAT ALG:

  DNS        : Enabled

  FTP        : Disabled

  H323       : Disabled

  ICMP-ERROR : Disabled

  ILS        : Disabled

  MGCP       : Disabled

  NBT        : Disabled

  PPTP       : Disabled

  RTSP       : Disabled

  RSH        : Disabled

  SCCP       : Disabled

  SIP        : Disabled

  SQLNET     : Disabled

  TFTP       : Disabled

  XDMCP      : Disabled

Related commands

display nat all

display nat all

Use display nat all to display all NAT configuration information.

Syntax

display nat all

Views

Any view

Predefined user roles

network-admin

network-operator

Examples

# (In standalone mode.) Display all NAT configuration information.

<Sysname> display nat all

NAT address group information:

  Totally 5 NAT address groups.

  Address group ID: 1:

    Port range: 1-65535

    Address information:

      Start address         End address

      202.110.10.10         202.110.10.15

 

  Address group ID: 2:

    Port range: 1-65535

    Address information:

      Start address         End address

      202.110.10.20         202.110.10.25

      202.110.10.30         202.110.10.35

 

  Address group ID: 3:

    Port range: 1024-65535

    Address information:

      Start address         End address

      202.110.10.40         202.110.10.50

 

  Address group ID: 4:

    Port range: 10001-65535

    Port block size: 500

    Extended block number: 1

    Address information:

      Start address         End address

      202.110.10.60         202.110.10.65

 

  Address group ID: 6:

    Port range: 1-65535

    Address information:

      Start address         End address

      ---                   ---

 

NAT server group information:

  Totally 3 NAT server groups.

  Group Number        Inside IP             Port        Weight

  1                   192.168.0.26          23          100

                      192.168.0.27          23          500

  2                   ---                   ---         ---

  3                   192.168.0.26          69          100

 

NAT inbound information:

  Totally 1 NAT inbound rules.

  Interface: Vlan-interface20

    ACL: 2038

    Address group ID: 2

    Add route: Y         NO-PAT:Y  Reversible: N

    Rule name: abc

    Priority: 1000

    NAT counting: 0

    Config status: Active

 

NAT outbound information:

  Totally 2 NAT outbound rules.

  Interface: Vlan-interface10

    ACL: 2036

    Address group ID: 1

    Port-preserved: Y        NO-PAT: N  Reversible: N

    Rule name: lee

    Priority: 122

    NAT counting: 0

    Config status: Inactive

    Reasons for inactive status:

      The following items don't exist or aren't effective: ACL.

 

  Interface: Vlan-interface10

    ACL: 2037

    Address group ID: 1

    Port-preserved: N        NO-PAT: Y  Reversible: Y

    Rule name: rabbit

    Priority: 100

    NAT counting: 0

      The following items don't exist or aren't effective: ACL.

 

NAT internal server information:

  Totally 2 internal servers.

  Interface: Vlan-interface10

    Global ACL    : 2000

    Local IP/port : 192.168.10.1/23

    Rule name     : sept

    Priority      : 1000

    NAT counting  : 0

    Config status : Active

 

  Interface: Vlan-interface20

    Protocol: 6(TCP)

    Global IP/port: 50.1.1.1/23

    Local IP/port : 192.168.10.15/23

    ACL           : 2000

    Rule name     : blue

    NAT counting  : 0

    Config status : Active

 

Static NAT mappings:

  Totally 2 inbound static NAT mappings.

  Net-to-net:

    Global IP    : 2.2.2.1 – 2.2.2.255

    Local IP     : 1.1.1.0

    Netmask      : 255.255.255.0

    ACL          : 3000

    Reversible   : Y

    Rule name    : green

    Priority     : 4

    NAT counting : 0

    Config status: Active

 

  IP-to-IP:

    Global IP    : 5.5.5.5

    Local IP     : 4.4.4.4

    ACL          : 2001

    Reversible   : Y

    Rule name    : blue

    Priority     : 4

    NAT counting : 0

    Config status: Inactive

    Reasons for inactive status:

      The following items don't exist or aren't effective: ACL.

 

  Totally 2 outbound static NAT mappings.

  Net-to-net:

    Local IP     : 1.1.1.1 - 1.1.1.255

    Global IP    : 2.2.2.0

    Netmask      : 255.255.255.0

    ACL          : 3000

    Reversible   : Y

    Rule name    : yellow

    Priority     : 5

    NAT counting : 0

    Config status: Active

 

  IP-to-IP:

    Local IP     : 4.4.4.4

    Global IP    : 5.5.5.5

    ACL:         : 2001

    Reversible   : Y

    Rule name    : pink

    Priority     : 6

    NAT counting : 0

    Config status: Inactive

    Reasons for inactive status:

      The following items don't exist or aren't effective: ACL.

 

Interfaces enabled with static NAT:

  Totally 2 interfaces enabled with static NAT.

  Interface: Vlan-interface20

    Config status: Active

 

  Interface: Vlan-interface30

    Config status: Active

 

NAT DNS mappings:

  Totally 2 NAT DNS mappings.

  Domain name  : www.server.com

  Global IP    : 6.6.6.6

  Global port  : 23

  Protocol     : TCP(6)

  Config status: Active

 

  Domain name  : www.service.com

  Global IP    : ---

  Global port  : 12

  Protocol     : TCP(6)

  Config status: Inactive

  Reasons for inactive status:

    The following items don't exist or aren't effective: interface IP address.

 

NAT logging:

  Log enable          : Enabled(ACL 2000)

  Flow-begin          : Disabled

  Flow-end            : Disabled

  Flow-active         : Enabled(10 minutes)

  Port-block-assign   : Disabled

  Port-block-withdraw : Disabled

  Alarm               : Disabled

  NO-PAT IP usage     : Disabled

 

NAT hairpinning:

  Totally 2 interfaces enabled with NAT hairpinning.

  Interface: Vlan-interface10

    Config status: Active

 

  Interface: Vlan-interface20

    Config status: Active

 

NAT mapping behavior:

  Mapping mode : Endpoint-Independent

  ACL          : 2050

  Config status: Active

 

NAT ALG:

  DNS        : Enabled

  FTP        : Disabled

  H323       : Enabled

  ICMP-ERROR : Enabled

  ILS        : Enabled

  MGCP       : Enabled

  NBT        : Enabled

  PPTP       : Enabled

  RSH        : Enabled

  RTSP       : Enabled

  SCCP       : Enabled

  SIP        : Disabled

  SQLNET     : Enabled

  TFTP       : Enabled

  XDMCP      : Enabled

 

NAT port block group information:

  Totally 3 NAT port block groups.

  Port block group 1:

    Port range: 1-65535

    Block size: 256

    Local IP address information:

      Start address        End address          VPN instance

      172.16.1.1           172.16.1.254         ---

      192.168.1.1          192.168.1.254        ---

      192.168.3.1          192.168.3.254        ---

    Global IP pool information:

      Start address        End address

      201.1.1.1            201.1.1.10

      201.1.1.21           201.1.1.25

 

  Port block group 2:

    Port range: 10001-30000

    Block size: 500

    Local IP address information:

      Start address        End address          VPN instance

      10.1.1.1             10.1.10.255          ---

    Global IP pool information:

      Start address        End address

      202.10.10.101        202.10.10.120

 

  Port block group 3:

    Port range: 1-65535

    Block size: 256

    Local IP address information:

      Start address        End address          VPN instance

      ---                  ---                  ---

    Global IP pool information:

      Start address        End address

      ---                  ---

 

NAT outbound port block group information:

  Totally 2 outbound port block group items.

  Interface: Vlan-interface20

    port-block-group: 2

    Rule name       : red

    NAT counting: 0

    Config status   : Active

 

  Interface: Vlan-interface20

    port-block-group: 10

    Rule name: lee

    NAT counting: 0

    Config status   : Inactive

    Reasons for inactive status:

      The following items don't exist or aren't effective: port block group.

 

Static NAT load balancing:     Disabled

# (In IRF mode.) Display all NAT configuration information.

<Sysname> display nat all

NAT address group information:

  Totally 5 NAT address groups.

  Address group 1:

    Port range: 1-65535

    Address information:

      Start address         End address

      202.110.10.10         202.110.10.15

 

  Address group 2:

    Port range: 1-65535

    Address information:

      Start address         End address

      202.110.10.20         202.110.10.25

      202.110.10.30         202.110.10.35

 

  Address group 3:

    Port range: 1024-65535

    Address information:

      Start address         End address

      202.110.10.40         202.110.10.50

 

  Address group 4:

    Port range: 10001-65535

    Port block size: 500

    Extended block number: 1

    Address information:

      Start address         End address

      202.110.10.60         202.110.10.65

 

  Address group 6:

    Port range: 1-65535

    Address information:

      Start address         End address

      ---                   ---

 

NAT server group information:

  Totally 3 NAT server groups.

  Group Number        Inside IP             Port        Weight

  1                   192.168.0.26          23          100

                      192.168.0.27          23          500

  2                   ---                   ---         ---

  3                   192.168.0.26          69          100

 

NAT inbound information:

  Totally 1 NAT inbound rules.

  Interface: Vlan-interface10

    ACL: 2038

    Address group ID: 2

    Add route: Y        NO-PAT: Y  Reversible: N

    Rule name: abcdefg

    Priority: 1000

    NAT counting : 0

    Config status: Active

 

NAT outbound information:

  Totally 2 NAT outbound rules.

  Interface: Vlan-interface20

    ACL: 2036

    Address group ID: 1

    Port-preserved: Y        NO-PAT: N  Reversible: N

    Rule name: cdefg

    Priority: 1001

    NAT counting : 0

    Config status: Inactive

    Reasons for inactive status:

      The following items don't exist or aren't effective: address group, and ACL.

 

  Interface: Vlan-interface20

    ACL: 2037

    Address group ID: 1

    Port-preserved: N        NO-PAT: Y  Reversible: Y

    Rule name: blue

    Priority: 1002

    NAT counting : 0

    Config status: Active.

 

NAT internal server information:

  Totally 5 internal servers.

  Interface: Vlan-interface10

    Global ACL    : 2000

    Local IP/port : 192.168.10.1/23

    Rule name     : cdefgab

    Priority      : 1000

    NAT counting  : 0

    Config status : Active

 

  Interface: Vlan-interface20

    Protocol: 6(TCP)

    Global IP/port: 50.1.1.1/23

    Local IP/port : 192.168.10.15/23

    ACL           : 2000

    Rule name     : green

    NAT counting  : 0

    Config status : Active

 

  Interface: Vlan-interface30

    Protocol: 6(TCP)

    Global IP/port: 50.1.1.1/23-30

    Local IP/port : 192.168.10.15-192.168.10.22/23

    Rule name     : blue

    NAT counting  : 0

    Config status : Active

 

  Interface: Vlan-interface40

    Protocol: 255(Reserved)

    Global IP/port: 50.1.1.100/---

    Local IP/port : 192.168.10.150/---

    ACL           : 3000

    Rule name     : white

    NAT counting  : 0

    Config status : Inactive

    Reasons for inactive status:

      The following items don't exist or aren't effective: ACL.

 

  Interface: Vlan-interface50

    Protocol: 17(UDP)

    Global IP/port: 50.1.1.2/23

    Local IP/port : server group 1

                    192.168.0.26/23       (Connections: 10)

                    192.168.0.27/23       (Connections: 20)

    Rule name     : black

    NAT counting  : 0

    Config status : Active

 

Static NAT mappings:

  Totally 2 inbound static NAT mappings.

  Net-to-net:

    Global IP    : 2.2.2.1 – 2.2.2.255

    Local IP     : 1.1.1.0

    Netmask      : 255.255.255.0

    ACL          : 2000

    Reversible   : Y

    Rule name     : pink

    Priority      : 1000

    NAT counting : 0

    Config status: Active

 

  IP-to-IP:

    Global IP    : 5.5.5.5

    Local IP     : 4.4.4.4

    ACL          : 2001

    Reversible   : Y

    Rule name    : yellow

    Priority     : 1000

    NAT counting : 0

    Config status: Inactive

    Reasons for inactive status:

      The following items don't exist or aren't effective: ACL.

 

  Totally 2 outbound static NAT mappings.

  Net-to-net:

    Local IP     : 1.1.1.1 - 1.1.1.255

    Global IP    : 2.2.2.0

    Netmask      : 255.255.255.0

    ACL          : 2000

    Reversible   : Y

    Rule name    : grey

    Priority     : 1000

    NAT counting : 0

    Config status: Active

 

  IP-to-IP:

    Local IP     : 4.4.4.4

    Global IP    : 5.5.5.5

    ACL:         : 2001

    Reversible   : Y

    Rule name    : orange

    Priority     : 10000

    NAT counting : 0

    Config status: Inactive

    Reasons for inactive status:

      The following items don't exist or aren't effective: ACL.

 

Interfaces enabled with static NAT:

  Totally 2 interfaces enabled with static NAT.

  Interface: Vlan-interface40

    Config status: Active

 

  Interface: Vlan-interface50

    Config status: Active

 

NAT DNS mappings:

  Totally 2 NAT DNS mappings.

  Domain name  : www.server.com

  Global IP    : 6.6.6.6

  Global port  : 23

  Protocol     : TCP(6)

  Config status: Active

 

  Domain name  : www.service.com

  Global IP    : ---

  Global port  : 12

  Protocol     : TCP(6)

  Config status: Inactive

  Reasons for inactive status:

    The following items don't exist or aren't effective: interface IP address.

 

NAT logging:

  Log enable          : Enabled(ACL 2000)

  Flow-begin          : Disabled

  Flow-end            : Disabled

  Flow-active         : Enabled(10 minutes)

  Port-block-assign   : Disabled

  Port-block-withdraw : Disabled

  Alarm               : Disabled

  NO-PAT IP usage     : Disabled

 

NAT hairpinning:

  Totally 2 interfaces enabled with NAT hairpinning.

  Interface: Vlan-interface40

    Config status: Active

 

  Interface: Vlan-interface50

    Config status: Active

 

NAT mapping behavior:

  Mapping mode : Endpoint-Independent

  ACL          : 2050

  Config status: Active

 

NAT ALG:

  DNS        : Enabled

  FTP        : Enabled

  H323       : Enabled

  ICMP-ERROR : Enabled

  ILS        : Enabled

  MGCP       : Enabled

  NBT        : Enabled

  PPTP       : Enabled

  RTSP       : Enabled

  RSH        : Enabled

  SCCP       : Enabled

  SIP        : Enabled

  SQLNET     : Enabled

  TFTP       : Enabled

  XDMCP      : Disabled

 

NAT port block group information:

  Totally 3 NAT port block groups.

  Port block group 1:

    Port range: 1-65535

    Block size: 256

    Local IP address information:

      Start address        End address          VPN instance

      172.16.1.1           172.16.1.254         ---

      192.168.1.1          192.168.1.254        ---

      192.168.3.1          192.168.3.254        ---

    Global IP pool information:

      Start address        End address

      201.1.1.1            201.1.1.10

      201.1.1.21           201.1.1.25

 

  Port block group 2:

    Port range: 10001-30000

    Block size: 500

    Local IP address information:

      Start address        End address          VPN instance

      10.1.1.1             10.1.10.255          ---

    Global IP pool information:

      Start address        End address

      202.10.10.101        202.10.10.120

 

  Port block group 3:

    Port range: 1-65535

    Block size: 256

    Local IP address information:

      Start address        End address          VPN instance

      ---                  ---                  ---

    Global IP pool information:

      Start address        End address

      ---                  ---

 

NAT outbound port block group information:

  Totally 2 outbound port block group items.

  Interface: Vlan-interface20

    port-block-group: 2

    Rule name: stone

    NAT counting: 0

    Config status   : Active

 

  Interface: Vlan-interface20

    port-block-group: 10

    NAT counting: 0

    Config status   : Inactive

    Reasons for inactive status:

      The following items don't exist or aren't effective: port block group.

 

Static NAT load balancing:     Disabled

The output shows all NAT configuration information. Table 2 describes only the fields for the output of the nat hairpin enable, nat mapping-behavior, and nat alg commands.

Table 2 Command output

Field

Description

NAT address group information

Information about the NAT address group. See Table 1 for output description.

NAT server group information

Information about the internal server group. See Table 14 for output description.

NAT inbound information:

Inbound dynamic NAT configuration. See Table 5 for output description.

NAT outbound information

Outbound dynamic NAT configuration. See Table 8 for output description.

NAT internal server information

NAT server mapping configuration. See Table 13 for output description.

Static NAT mappings

Static NAT mappings. See Table 16 for output description.

NAT DNS mappings

NAT DNS mappings. See Table 3 for output description.

NAT logging

NAT logging configuration. See Table 6 for output description.

NAT hairpinning

NAT hairpin configuration.

Interface

NAT hairpin-enabled interface.

Rule name

Name of the NAT rule.

NAT counting

Number of times the NAT rule is matched.

Priority

Priority of the NAT rule.

Config status

Status of the NAT hairpin configuration: Active or Inactive.

Reasons for inactive status

Reasons why the NAT hairpin configuration does not take effect. This field is available when the Config status is Inactive.

NAT mapping behavior

Mapping behavior mode of PAT: Endpoint-Independent or Address and Port-Dependent.

ACL

ACL number or name. If no ACL is specified for NAT, this field displays hyphens (---).

Config status

Status of the NAT mapping behavior configuration: Active or Inactive.

Reasons for inactive status

Reasons why the NAT mapping behavior configuration does not take effect. This field is available when the Config status is Inactive.

NAT ALG

NAT ALG configuration for different protocols.

NAT port block group information

Configuration information about NAT port block groups. See Table 11 for output description.

NAT outbound port block group information

Configuration information about static outbound port block mapping rules. See Table 9 for output description.

display nat dns-map

Use display nat dns-map to display NAT DNS mappings.

Syntax

display nat dns-map

Views

Any view

Predefined user roles

network-admin

network-operator

Examples

# Display NAT DNS mappings.

<Sysname> display nat dns-map

NAT DNS mapping information:

  Totally 2 NAT DNS mappings.

  Domain name  : www.server.com

  Global IP    : 6.6.6.6

  Global port  : 23

  Protocol     : TCP(6)

  Config status: Active

 

  Domain name  : www.service.com

  Global IP    : ---

  Global port  : 12

  Protocol     : TCP(6)

  Config status: Inactive

  Reasons for inactive status:

    The following items don't exist or aren't effective: interface IP address.

Table 3 Command output

Field

Description

NAT DNS mapping information

Information about NAT DNS mappings.

Totally n NAT DNS mappings

Total number of NAT DNS mappings.

Domain name

Domain name of the internal server.

Global IP

Public IP address of the internal server.

·     If Easy IP is configured, this field displays the IP address of the specified interface.

·     If you do not specify a public IP address, this field displays hyphens (---).

Global port

Public port number of the internal server.

Protocol

Protocol name and number of the internal server.

Config status

Status of the DNS mapping: Active or Inactive.

Reasons for inactive status

Reasons why the DNS mapping does not take effect. This field is available when the Config status is Inactive.

Related commands

nat dns-map

display nat eim

Use display nat eim to display information about NAT Endpoint-Independent Mapping (EIM) entries.

Syntax

In standalone mode:

display nat eim

In IRF mode:

display nat eim [ slot slot-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

slot slot-number: Specifies an IRF member device by its member ID. If you do not specify a member device, this command displays EIM entry information for all member devices. (In IRF mode.)

Usage guidelines

EIM entries are created when PAT operates in EIM mode. An EIM entry is a 3-tuple entry, and it records the mapping between a private address/port and a public address/port.

The EIM entry provides the following functions:

·     The same EIM entry applies to subsequent connections initiated from the same source IP and port.

·     The EIM entries allow reverse translation for connections initiated from external hosts to internal hosts.

Examples

# (In standalone mode.) Display information about NAT EIM entries.

<Sysname> display nat eim

Slot 0:

Local  IP/port: 192.168.100.100/1024

Global IP/port: 200.100.1.100/2048

Protocol: TCP(6)

 

Local  IP/port: 192.168.100.200/2048

Global IP/port: 200.100.1.200/4096

Protocol: UDP(17)

 

Total entries found: 2

# (In IRF mode.) Display information about EIM entries for the specified slot.

<Sysname> display nat eim slot 1

Slot 1:

Local  IP/port: 192.168.100.100/1024

Global IP/port: 200.100.1.100/2048

Protocol: TCP(6)

 

Local  IP/port: 192.168.100.200/2048

Global IP/port: 200.100.1.200/4096

Protocol: UDP(17)

 

Total entries found: 2

Table 4 Command output

Field

Description

Protocol

Protocol name and number.

Total entries found

Total number of EIM entries.

Related commands

nat mapping-behavior

nat outbound

display nat inbound

Use display nat inbound to display inbound dynamic NAT configuration.

Syntax

display nat inbound

Views

Any view

Predefined user roles

network-admin

network-operator

Examples

# (In standalone mode.) Display inbound dynamic NAT configuration.

<Sysname> display nat inbound

NAT inbound information:

  Totally 2 NAT inbound rules.

  Interface: Vlan-interface20

    ACL: 2038

    Address group ID: 2

    Add route: Y          NO-PAT: Y  Reversible: N

    Rule name: abcd

    Priority: 1000

    NAT counting: 0

    Config status: Active

 

Interface: Vlan-interface30

    ACL: 2037

    Address group ID: 1       Address group name: abc

    Add route: Y           NO-PAT: Y  Reversible: N

    Rule name: eif

    Priority: 1000

    NAT counting: 0

    Config status: Inactive

    Reasons for inactive status:

      The following items don't exist or aren't effective: ACL.

# (In IRF mode.) Display inbound dynamic NAT configuration.

<Sysname> display nat inbound

NAT inbound information:

  Totally 2 NAT inbound rules.

  Interface: Vlan-interface20

    ACL: 2038

    Address group ID: 2

    Add route: Y            NO-PAT: Y  Reversible: N

    Rule name: abcd

    Priority: 1000

    NAT counting: 0

    Config status: Active

 

Interface: Vlan-interface30

    Address group ID: 1

    Add route: Y             NO-PAT: Y  Reversible: N

    Rule name: eif

    Priority: 1001

    NAT counting: 0

    Config status: Inactive

    Reasons for inactive status:

      The following items don't exist or aren't effective: ACL.

Table 5 Command output

Field

Description

NAT inbound information

Information about inbound dynamic NAT configuration.

Totally n NAT inbound rules

Total number of inbound dynamic NAT rules.

Interface

Interface where the inbound dynamic NAT rule is configured.

ACL

ACL number or name.

Address group ID

ID of the NAT address group used by the inbound dynamic NAT rule.

Address group name

Name of the NAT address group. If no address group name is configured, this field is not displayed.

Add route

Whether to add a route when a packet matches the inbound dynamic NAT rule:

·     YAdds a route.

·     NDoes not add a route.

NO-PAT

Whether NO-PAT or PAT is used:

·     YNO-PAT is used.

·     NPAT is used.

Reversible

Whether reverse address translation is allowed:

·     YReverse address translation is allowed.

·     NReverse address translation is not allowed.

Rule name

Name of the NAT rule.

Priority

Priority of the NAT rule.

NAT counting

Number of times the NAT rule is matched.

Config status

Status of the inbound dynamic NAT rule: Active or Inactive.

Reasons for inactive status

Reasons why the inbound dynamic NAT rule does not take effect:

This field is available when the Config status is Inactive.

Related commands

nat inbound

display nat log

Use display nat log to display NAT logging configuration.

Syntax

display nat log

Views

Any view

Predefined user roles

network-admin

network-operator

Examples

# Display NAT logging configuration.

<Sysname> display nat log

NAT logging:

  Log enable          : Enabled(ACL 2000)

  Flow-begin          : Disabled

  Flow-end            : Disabled

  Flow-active         : Enabled(10 minutes)

  Port-block-assign   : Disabled

  Port-block-withdraw : Disabled

  Alarm               : Disabled

Table 6 Command output

Field

Description

NAT logging

NAT logging configuration.

Log enable

Enabling status of NAT logging.

If an ACL is specified for NAT logging, this field also displays the ACL number or name.

Flow-begin

Enabling status of logging for NAT session establishment events.

Flow-end

Enabling status of logging for NAT session removal events.

Flow-active

Enabling status of logging for active NAT flows. If it is enabled, this field also displays the interval in minutes at which active flow logs are generated.

Port-block-assign

Enabling status of NAT444 user logging for port block assignment.

Port-block-withdraw

Enabling status of NAT444 user logging for port block withdrawal.

Alarm

Enabling status of logging for NAT alarms.

Related commands

nat log enable

nat log flow-active

nat log flow-begin

display nat no-pat

Use display nat no-pat command to display information about NAT NO-PAT entries.

Syntax

In standalone mode:

display nat no-pat

In IRF mode:

display nat no-pat [ slot slot-number ]

Views

Any view

Default user roles

network-admin

network-operator

Parameters

slot slot-number: Specifies an IRF member device by its member ID. If you do not specify a member device, this command displays NO-PAT entry information for all member devices. (In IRF mode.)

Usage guidelines

A NO-PAT entry records the mapping between a private address and a public address.

The NO-PAT entry provides the following functions:

·     The same entry applies to subsequent connections initiated from the same source IP address.

·     The NO-PAT entries allow reverse translation for connections initiated from external hosts to internal hosts.

Outbound and inbound NO-PAT address translations create their own NO-PAT tables. These two types of tables are displayed separately.

Examples

# (In standalone mode.) Display information about NO-PAT entries for all cards.

<Sysname> display nat no-pat

Slot 0:

Global  IP: 200.100.1.100

Local   IP: 192.168.100.100

Reversible: N

Type      : Inbound

Local   IP: 192.168.100.200

Global  IP: 200.100.1.200

Reversible: Y

Type      : Outbound

Total entries found: 2

# (In IRF mode.) Display information about NO-PAT entries for the specified slot.

<Sysname> display nat no-pat slot 1

Slot 1:

Global  IP: 200.100.1.100

Local   IP: 192.168.100.100

Reversible: N

Type      : Inbound

Local   IP: 192.168.100.200

Global  IP: 200.100.1.200

Reversible: Y

Type      : Outbound

Total entries found: 2

Table 7 Command output

Field

Description

Global IP

Public IP address.

Local IP

Private IP address.

Reversible

Whether reverse address translation is allowed:

·     Y—Reverse address translation is allowed.

·     N—Reverse address translation is not allowed.

Type

Type of the NO-PAT entry:

·     Inbound—A NO-PAT entry created during inbound dynamic NAT.

·     Outbound—A NO-PAT entry created during outbound dynamic NAT.

Total entries found

Total number of NO-PAT entries.

Related commands

nat inbound

nat outbound

display nat outbound

Use display nat outbound to display outbound dynamic NAT configuration.

Syntax

display nat outbound

Views

Any view

Predefined user roles

network-admin

network-operator

Examples

# (In standalone mode.) Display outbound dynamic NAT configuration.

<Sysname> display nat outbound

NAT outbound information:

  Totally 2 NAT outbound rules.

  Interface: Vlan-interface10

    Address group ID: 1

    Port-preserved: Y        NO-PAT: N  Reversible: N

    Rule name: acdefg

    Priority: 1000

    NAT counting: 0

    Config status: Active

 

  Interface: Vlan-interface10

    ACL: 2037

    Address group ID: ---

    Port-preserved: N         NO-PAT: Y  Reversible: Y

    Rule name: abefg

    Priority: 1000

    NAT counting: 0

    Config status: Inactive

    Reasons for inactive status:

      The following items don't exist or aren't effective: ACL

 

  Interface: Vlan-interface10

    ACL: 2100

    Address group ID: 2

    Port-preserved: N          NO-PAT: N  Reversible: N

    Priority: 0

    NAT counting: 0

    Config status: Active

# (In IRF mode.) Display outbound dynamic NAT configuration.

<Sysname> display nat outbound

NAT outbound information:

  Totally 2 NAT outbound rules.

  Interface: Vlan-interface10

    ACL: 2036

    Address group ID: 1

    Port-preserved: Y           NO-PAT: N  Reversible: N

    Rule name: abefg

    Priority: 1000

    NAT counting: 0

    Config status: Active

 

  Interface: Vlan-interface20

    ACL: 2037

    Address group ID: 2

    Port-preserved: N            NO-PAT: Y  Reversible: Y

    Rule name: cdefg

    Priority: 1001

    NAT counting: 0

    Config status: Inactive

    Reasons for inactive status:

      The following items don't exist or aren't effective: ACL.

 

  Interface: Vlan-interface10

    ACL: 2100

    Address group ID: 2

    Port-preserved: N             NO-PAT: N  Reversible: N

    Priority: 0

    NAT counting: 0

    Config status: Active

Table 8 Command output

Field

Description

NAT outbound information

Information about outbound dynamic NAT configuration.

Totally n NAT outbound rules

Total number of outbound dynamic NAT rules.

Interface

Interface where the outbound dynamic NAT rule is configured.

ACL

IPv4 ACL number or name. If no IPv4 ACL is specified for outbound dynamic NAT rule, this field displays hyphens (---).

Address group ID

ID of the address group used by the outbound dynamic NAT rule. If no address group is specified, the field displays hyphens (---).

Address group name

Name of the NAT address group. If no address group name is configured, this field is not displayed.

Port-preserved

Whether to try to preserve the port numbers for PAT.

·     YTries to preserve the port numbers.

·     NAllows translating port numbers.

NO-PAT

Whether NO-PAT is used:

·     YNO-PAT is used.

·     NPAT is used.

Reversible

Whether reverse address translation is allowed:

·     Y—Reverse address translation is allowed.

·     N—Reverse address translation is not allowed.

Rule name

Name of the NAT rule.

Priority

Priority of the NAT rule.

NAT counting

Number of times the NAT rule is matched.

Config status

Status of the outbound dynamic NAT rule: Active or Inactive.

Reasons for inactive status

Reasons why the outbound dynamic NAT rule does not take effect.

This field is available when the Config status is Inactive.

Related commands

nat outbound

display nat outbound port-block-group

Use display nat outbound port-block-group to display static outbound port block mapping rules for NAT444.

Syntax

display nat outbound port-block-group

Views

Any view

Predefined user roles

network-admin

network-operator

Examples

# Display static outbound port block mapping rules for NAT444.

<Sysname> display nat outbound port-block-group

NAT outbound port block group information:

  Totally 2 outbound port block group items.

  Interface: Vlan-interface20

    port-block-group: 2

    Rule name: abcdefg

    NAT counting: 0

    Config status   : Active

 

  Interface: Vlan-interface20

    port-block-group: 10

    Rule name: abcfg

    NAT counting: 0

    Config status   : Inactive

    Reasons for inactive status:

      The following items don't exist or aren't effective: port block group.

Table 9 Command output

Field

Description

NAT outbound port block group information

Information about static outbound port block mapping rules.

Totally n outbound port block group items

Total number of static outbound port block mapping rules.

Interface

Interface where the static outbound port block mapping rules configured.

port-block-group

ID of the port block group.

Rule name

Name of the static outbound port block mapping rule.

NAT counting

Number of times the mapping rule is matched.

Config status

Status of the port block mapping rule: Active or Inactive.

Reasons for inactive status

Reasons why the port block mapping rule does not take effect. This field is available when the Config status is Inactive.

Related commands

nat outbound port-block-group

display nat port-block

Use display nat port-block to display NAT port block mappings.

Syntax

In standalone mode:

display nat port-block { dynamic [ address-group { group-id | name group-name } ] | static [ port-block-group group-id ] }

In IRF mode:

display nat port-block { dynamic [ address-group { group-id | name group-name } ] | static [ port-block-group group-id ] } [ slot slot-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

dynamic: Displays dynamic port block mappings.

address-group: Displays port block mappings for the specified address group. If you do not specify a NAT address group, this command displays port block mappings for all address groups.

group-id: Specifies the ID of the address group. The value range for this argument is 0 to 65535.

name group-name: Specifies the name of the address group. The name is a case-insensitive string of 1 to 63 characters.

static: Displays static port block mappings.

port-block-group group-id: Displays port block mappings for the specified port block group. The group-id argument specifies the ID of the port block group. The value range for the group-id argument is 0 to 65535. If you do not specify a port block group, this command displays port block mappings for all port block groups.

slot slot-number: Specifies an IRF member device by its member ID. If you do not specify a member device, this command displays port block mappings for all member devices. (In IRF mode.)

Examples

# (In standalone mode.) Display static port block mappings.

<Sysname> display nat port-block static

Slot 0:

Local VPN     Local IP         Global IP        Port block   Connections

---           100.100.100.111  202.202.100.101  10001-10256  0

---           100.100.100.112  202.202.100.101  10257-10512  0

---           100.100.100.113  202.202.100.101  10513-10768  0

---           100.100.100.113  202.202.100.101  10769-11024  0

Total mappings found: 4

# (In IRF mode.) Display static port block mappings for the specified slot.

<Sysname> display nat port-block static slot 1

Slot 1:

Local VPN     Local IP         Global IP        Port block   Connections

---           100.100.100.111  202.202.100.101  10001-10256  0

---           100.100.100.112  202.202.100.101  10257-10512  0

---           100.100.100.113  202.202.100.101  10513-10768  0

---           100.100.100.113  202.202.100.101  10769-11024  0

Total mappings found: 4

# (In standalone mode.) Display dynamic port block mappings.

<Sysname> display nat port-block dynamic

Slot 0:

Local VPN     Local IP         Global IP        Port block   Connections

---           101.1.1.12       192.168.135.201  10001-11024  1

Total mappings found: 1

# (In IRF mode.) Display dynamic port block mappings.

<Sysname> display nat port-block dynamic slot 1

Slot 1:

Local VPN     Local IP         Global IP        Port block   Connections

---           101.1.1.12       192.168.135.201  10001-11024  1

Total mappings found: 1

Table 10 Command output

Field

Description

Local VPN

This field is not supported in the current software version.

MPLS L3VPN instance to which the private IP address belongs. If the private IP address does not belong to any VPN instance, this field displays hyphens (---).

Local IP

Private IP address.

Global IP

Public IP address.

Port block

Port block defined by a start port number and an end port number.

Connections

Number of connections established by using the ports in the port block.

display nat port-block-group

Use display nat port-block-group to display NAT port block group configuration.

Syntax

display nat port-block-group [ group-id ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

group-id: Specifies the ID of a NAT port block group. The value range for this argument is 0 to 65535. If you do not specify this argument, the command displays configuration of all NAT port block groups.

Examples

# Display configuration of all NAT port block groups.

<Sysname> display nat port-block-group

NAT port block group information:

  Totally 3 NAT port block groups.

  Port block group 1:

    Port range: 1-65535

    Block size: 256

    Local IP address information:

      Start address        End address          VPN instance

      172.16.1.1           172.16.1.254         ---

      192.168.1.1          192.168.1.254        ---

      192.168.3.1          192.168.3.254        ---

    Global IP pool information:

      Start address        End address

      201.1.1.1            201.1.1.10

      201.1.1.21           201.1.1.25

 

  Port block group 2:

    Port range: 10001-30000

    Block size: 500

    Local IP address information:

      Start address        End address          VPN instance

      10.1.1.1             10.1.10.255          ---

    Global IP pool information:

      Start address        End address

      202.10.10.101        202.10.10.120

 

  Port block group 3:

    Port range: 1-65535

    Block size: 256

    Local IP address information:

      Start address        End address          VPN instance

      ---                  ---                  ---

    Global IP pool information:

      Start address        End address

      ---                  ---

# Display information about NAT port block group 1.

<Sysname> display nat port-block-group 1

  Port block group 1:

    Port range: 1-65535

    Block size: 256

    Local IP address information:

      Start address        End address          VPN instance

      172.16.1.1           172.16.1.254         ---

      192.168.1.1          192.168.1.254        ---

      192.168.3.1          192.168.3.254        ---

    Global IP pool information:

      Start address        End address

      201.1.1.1            201.1.1.10

      201.1.1.21           201.1.1.25

Table 11 Command output

Field

Description

NAT port block group information

Information about the port block group configuration.

Totally n NAT port block groups

Total number of port block groups.

Port block group

ID of the port block group.

Port range

Port range for the public IP addresses.

Block size

Number of ports in a port block.

Local IP address information

Information about the private IP addresses.

Global IP pool information

Information about the public IP addresses.

Start address

Start IP address of a private or public IP address range. If no start IP address is specified for the address range, this field displays hyphens (---).

End address

End IP address of a private or public IP address range. If no end IP address is specified for the address range, this field displays hyphens (---).

VPN instance

This field is not supported in the current software version.

MPLS L3VPN instance to which the private IP address range belongs. If no VPN instance is specified for the private address range, this field displays hyphens (---).

Related commands

nat port-block-group

display nat port-block-usage

Use display nat port-block-usage to display the port block usage for address groups.

Syntax

In standalone mode:

display nat port-block-usage [ address-group group-id ]

In IRF mode:

display nat port-block-usage [ address-group group-id ] [ slot slot-number ]

Views

System view

Predefined user roles

network-admin

network-operator

Parameters

address-group group-id: Specifies the ID of an address group. The value range for the group-id argument is 0 to 65535. If you do not specify an address group, this command displays the port block usage for all address groups.

slot slot-number: Specifies an IRF member device by its member ID. If you do not specify a member device, this command displays the port block usage for all member devices. (In IRF mode.)

Examples

# (In standalone mode.) Display the port block usage for address groups.

<Sysname> display nat port-block-usage

Slot 1:

Address group 0 on channel 0:

  Total port block entries :10

  Active port block entries:9

  Current port block usage :90%

 

Total NAT address groups found: 1

# (In IRF mode.) Display the port block usage for address groups for slot 1.

<Sysname> display nat port-block-usage slot 1

Slot 1:

Address group 0 on channel 0:

  Total port block entries :10

  Active port block entries:9

  Current port block usage :90%

Total NAT address groups found: 1

Table 12 Command output

Field

Description

CPU

Number of the CPU.

Address group

ID of the address group.

channel

Field-programmable gate array (FPGA) ID.

Total port block entries

Total number of port blocks in the address group.

Active port block entries

Total number of assigned port blocks in the address group.

Current port block usage

Port block usage in the address group.

Total NAT address groups found

Total number of address groups.

display nat server

Use display nat server to display NAT server mappings.

Syntax

display nat server

Views

Any view

Predefined user roles

network-admin

network-operator

Examples

# (In standalone mode.) Display NAT server mappings.

<Sysname> display nat server

NAT internal server information:

  Totally 2 internal servers.

  Interface: Vlan-interface10

    Protocol: 6(TCP)

    Global IP/port: 50.1.1.1/23-30

    Local IP/port : 192.168.10.15-192.168.10.22/23

    Rule name     : abcg

    NAT counting  : 0

    Config status : Inactive

    Reasons for inactive status:

      The following items don't exist or aren't effective: ACL.

 

  Interface: Vlan-interface20

    Protocol: 255(Reserved)

    Global IP/port: 50.1.1.100/---

    Local IP/port : 192.168.10.150/---

    Rule name     : abcdefg

    NAT counting  : 0

    Config status : Inactive

    Reasons for inactive status:

      The following items don't exist or aren't effective: interface IP address.

# (In IRF mode.) Display NAT server mappings.

<Sysname> display nat server

 

NAT internal server information:

  Totally 5 internal servers.

  Interface: Vlan-interface10

    Global ACL    : 2000

    Local IP/port : 192.168.10.1/23

    Rule name     : cdefgab

    Priority      : 1000

    NAT counting  : 0

    Config status : Active

 

  Interface: Vlan-interface30

    Protocol: 6(TCP)

    Global IP/port: 50.1.1.1/23

    Local IP/port : 192.168.10.15/23

    Rule name     : ace

    NAT counting  : 0

    Config status : Inactive

    Reasons for inactive status:

 

  Interface: Vlan-interface40

    Protocol: 6(TCP)

    Global IP/port: 50.1.1.1/23-30

    Local IP/port : 192.168.10.15-192.168.10.22/23

    Rule name     : abcdef

    NAT counting  : 0

    Config status : Inactive

    Reasons for inactive status:

      The following items don't exist or aren't effective: ACL.

 

  Interface: Vlan-interface40

    Protocol: 255(Reserved)

    Global IP/port: 50.1.1.100/---

    Local IP/port : 192.168.10.150/---

    Rule name     : cdefg

    NAT counting  : 0

    Config status : Active

 

  Interface: Vlan-interface50

    Protocol: 17(UDP)

    Global IP/port: 50.1.1.2/23

    Local IP/port : server group 1

                    1.1.1.1/21            (Connections: 10)

                    192.168.100.200/80    (Connections: 20)

    Rule name     : white

    NAT counting  : 0

    Config status : Active

Table 13 Command output

Field

Description

NAT internal server information

Information about NAT server mapping.

Interface

Interface where the NAT server mapping is configured.

Protocol

Protocol number and name of the internal server.

Global IP/port

Public IP address and port number of the internal server.

·     Global IP—A single IP address or an IP address range. If you use Easy IP, this field displays the IP address of the specified interface. If you do not specify an address for the interface, the Global IP field displays hyphens (---).

·     port—A single port number or a port number range. If no port number is in the specified protocol, the port field displays hyphens (---).

Local IP/port

For common NAT server mappings and object group-based NAT server mappings, this field displays the private IP address and port number of the internal server.

·     Local IP—A single IP address or an IP address range.

·     port—A single port number or a port number range. If no port number is in the specified protocol, the port field displays hyphens (---).

For a load sharing NAT server mapping, this field displays the internal server group ID, IP address, port number, and number of connections of each member.

ACL

ACL number or name. If no ACL is specified, this field is not displayed.

Rule name

Name of the NAT server mapping.

NAT counting

Number of times the NAT server mapping is matched.

Config status

Status of the NAT server mapping: Active or Inactive.

Reasons for inactive status

Reasons why the NAT server mapping does not take effect. This field is available when the Config status is Inactive.

Related commands

nat server

display nat server-group

Use display nat server-group to display internal server group configuration.

Syntax

display nat server-group [ group-id ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

group-id: Specifies the ID of the internal server group. The value range for this argument is 0 to 65535. If you do not specify this argument, the command displays the configuration of all internal server groups.

Examples

# Display the configuration of all internal server groups.

<Sysname> display nat server-group

NAT server group information:

  Totally 3 NAT server groups.

  Group Number        Inside IP             Port        Weight

  1                   192.168.0.26          23          100

                      192.168.0.27          23          500

  2                   ---                   ---         ---

  3                   192.168.0.26          69          100

 

# Display the configuration of internal server group 1.

<Sysname> display nat server-group 1

  Group Number        Inside IP             Port        Weight

  1                   192.168.0.26          23          100

                      192.168.0.27          23          500

 

Table 14 Command output

Field

Description

NAT server group information

Information about the NAT server group configuration.

Totally n NAT server groups

Total number of NAT server groups.

Group Number

ID of the internal server group.

Inside IP

Private IP address of a server in the internal server group. If no address is specified, this field displays hyphens (---).

Port

Private port number of a server in the internal server group. If no port number is specified, this field displays hyphens (---).

Weight

Weight of a server in the internal server group. If no weight value is specified, this field displays hyphens (---).

Related commands

nat server-group

display nat session

Use display nat session to display NAT sessions.

Syntax

In standalone mode:

display nat session [ [ responder ] { source-ip source-ip | destination-ip destination-ip } * ] [ verbose ]

In IRF mode:

display nat session [ [ responder ] { source-ip source-ip | destination-ip destination-ip } * ] [ slot slot-number ] [ verbose ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

responder: Displays NAT sessions by responder. If you do not specify this keyword, this command displays NAT sessions by initiator.

source-ip source-ip: Displays NAT sessions for the source IP address specified by the source-ip argument. The IP address must be the source IP address of the packet that triggers the session establishment.

destination-ip destination-ip: Displays NAT sessions for the destination IP address specified by the destination-ip argument. The IP address must be the destination IP address of the packet that triggers the session establishment.

slot slot-number: Specifies an IRF member device by its member ID. If you do not specify a member device, this command displays NAT sessions for all member devices. (In IRF mode.)

verbose: Displays detailed information about NAT sessions. If you do not specify this keyword, this command displays brief information about NAT sessions.

Usage guidelines

If you do not specify any parameters, this command displays all NAT sessions.

Examples

# (In standalone mode.) Display detailed information about NAT sessions.

<Sysname> display nat session verbose

Slot 0:

Initiator:

  Source      IP/port: 192.168.1.18/1877

  Destination IP/port: 192.168.1.55/22

  DS-Lite tunnel peer: -

  VPN instance/VLAN ID/Inline ID: -/-/-

  Protocol: TCP(6)

  Inbound interface: Vlan-interface10

  Source security zone: SrcZone

Responder:

  Source      IP/port: 192.168.1.55/22

  Destination IP/port: 192.168.1.10/1877

  DS-Lite tunnel peer: -

  VPN instance/VLAN ID/VLL ID: -/-/-

  Protocol: TCP(6)

  Inbound interface: Vlan-interface20

  Source security zone: DestZone

State: TCP_SYN_SENT

Application: SSH

Rule ID: -/-/-

Rule name:

Start time: 2011-07-29 19:12:36  TTL: 28s

Initiator->Responder:         1 packets         48 bytes

Responder->Initiator:         0 packets          0 bytes

 

Total sessions found: 1

# (In IRF mode.) Display detailed information about NAT sessions for the specified slot.

<Sysname> display nat session slot 1 verbose

Slot 1:

Initiator:

  Source      IP/port: 192.168.1.18/1877

  Destination IP/port: 192.168.1.55/22

  DS-Lite tunnel peer: -

  VPN instance/VLAN ID/Inline ID: -/-/-

  Protocol: TCP(6)

  Inbound interface: Vlan-interface10

Responder:

  Source      IP/port: 192.168.1.55/22

  Destination IP/port: 192.168.1.10/1877

  DS-Lite tunnel peer: -

  VPN instance/VLAN ID/Inline ID: -/-/-

  Protocol: TCP(6)

  Inbound interface: Vlan-interface20

State: TCP_SYN_SENT

Application: SSH

Rule ID: -/-/-

Rule name:

Start time: 2011-07-29 19:12:36  TTL: 28s

Initiator->Responder:         1 packets         48 bytes

Responder->Initiator:         0 packets          0 bytes

 

Total sessions found: 1

Table 15 Command output

Field

Description

Initiator

Session information about the initiator.

Responder

Session information about the responder.

Source IP/port

Source IP address and port number.

Destination IP/port

Destination IP address and port number.

DS-Lite tunnel peer

Destination address of the DS-Lite tunnel interface. If the session does not belong to any DS-Lite tunnel, this field displays a hyphen (-).

VPN instance/VLAN ID/Inline ID

MPLS L3VPN instance to which the session belongs. The VPN instance field is not supported in the current software version.

VLAN ID to which the session belongs for Layer 2 forwarding.

INLINE to which the session belongs for Layer 2 forwarding.

If a setting is not specified, this field displays a hyphen (-).

Protocol

Transport layer protocol type: DCCP, ICMP, Raw IP, SCTP, TCP, UDP, or UDP-Lite.

Inbound interface

Input interface.

State

NAT session status.

Application

Application layer protocol type, such as FTP and DNS.

This field displays OTHER for the protocol types identified by non-well-known ports.

Rule ID

ID of the security policy rule.

Rule name

Name of the security policy rule.

Start time

Time when the session starts.

TTL

Remaining NAT session lifetime in seconds.

Initiator->Responder

Number of packets and packet bytes from the initiator to the responder.

Responder->Initiator

Number of packets and packet bytes from the responder to the initiator.

Total sessions found

Total number of sessions.

Related commands

reset nat session

display nat static

Use display nat static to display static NAT mappings.

Syntax

display nat static

Views

Any view

Predefined user roles

network-admin

network-operator

Examples

# (In standalone mode.) Display static NAT mappings.

<Sysname> display nat static

Static NAT mappings:

  Totally 2 inbound static NAT mappings.

  Net-to-net:

    Global IP    : 1.1.1.1 - 1.1.1.255

    Local IP     : 2.2.2.0

    Netmask      : 255.255.255.0

    ACL          : 2000

    Reversible   : Y

    NAT counting : 0

    Rule name    : abcdefg

    Priority     : 1000

    Config status: Active

 

  IP-to-IP:

    Global IP    : 5.5.5.5

    Local IP     : 4.4.4.4

    ACL          : 2000

    Reversible   : Y

    Rule name    : abefg

    Priority     : 1000

    NAT counting : 0

   Config status: Inactive

    Reasons for inactive status:

      The following items don't exist or aren't effective: local VPN, global VPN, and ACL.

 

Totally 2 outbound static NAT mappings.

  Net-to-net:

    Local IP     : 1.1.1.1 - 1.1.1.255

    Global IP    : 2.2.2.0

    Netmask      : 255.255.255.0

    ACL          : 2000

    Reversible   : Y

    Rule name    : abefg

    Priority     : 1000

    NAT counting : 0

    Config status: Active

 

  IP-to-IP:

    Local IP     : 4.4.4.4

    Global IP    : 5.5.5.5

    ACL:         : 2001

    Reversible   : Y

    Rule name    : abcd

    Priority     : 1000

    NAT counting : 0

    Config status: Inactive

    Reasons for inactive status:

      The following items don't exist or aren't effective: ACL.

 

Interfaces enabled with static NAT:

  Totally 2 interfaces enabled with static NAT.

  Interface: Vlan-interface20

    Config status: Active

 

  Interface: Vlan-interface30

    Config status: Active

# (In IRF mode.) Display static NAT mappings.

<Sysname> display nat static

Static NAT mappings:

  Totally 2 inbound static NAT mappings.

  Net-to-net:

    Global IP    : 1.1.1.1 - 1.1.1.255

    Local IP     : 2.2.2.0

    Netmask      : 255.255.255.0

    ACL          : 2000

    Reversible   : Y

    Rule name    : adefg

    Priority     : 1000

    NAT counting : 0

    Config status: Active

 

  IP-to-IP:

    Global IP   : 5.5.5.5

    Local IP     : 4.4.4.4

    ACL          : 2001

    Reversible   : Y

    Rule name    : abefg

    Priority     : 1000

    NAT counting : 0

    Config status: Inactive

    Reasons for inactive status:

      The following items don't exist or aren't effective: ACL.

 

Totally 2 outbound static NAT mappings.

  Net-to-net:

    Local IP     : 1.1.1.1 - 1.1.1.255

    Global IP    : 2.2.2.0

    Netmask      : 255.255.255.0

    ACL          : 2000

    Reversible   : Y

    Rule name    : abcd

    Priority     : 1000

    NAT counting : 0

    Config status: Active

 

  IP-to-IP:

    Local IP     : 4.4.4.4

    Global IP    : 5.5.5.5

    ACL:         : 2000

    Rule name    : defg

    Priority     : 1000

    NAT counting : 0

    Reversible   : Y

    Config status: Inactive

    Reasons for inactive status:

      The following items don't exist or aren't effective: ACL.

 

Interfaces enabled with static NAT:

  Totally 1 interfaces enabled with static NAT.

  Interface: Vlan-interface20

    Config status: Active

Table 16 Command output

Field

Description

Static NAT mappings

Information about static NAT mapping configuration.

Totally n inbound static NAT mappings

Total number of inbound static NAT mappings.

Totally n outbound static NAT mappings

Total number of outbound static NAT mappings.

Net-to-net

Net-to-net static NAT mapping.

IP-to-IP

One-to-one static NAT mapping.

Local IP

Private IP address or address range.

Global IP

Public IP address or address range.

Netmask

Network mask.

ACL

ACL number or name. If no ACL is specified, this field is not displayed.

Reversible

Whether reverse address translation is allowed. If reverse address translation is allowed, this field displays Y. If reverse address translation is not allowed, this field is not displayed.

Interfaces enabled with static NAT

Interfaces on which static NAT is enabled.

Totally n interfaces enabled with static NAT

Total number of interfaces where static NAT is enabled.

Interface

Interface on which static NAT is enabled.

Rule name

Name of the NAT rule.

Priority

Priority of the NAT rule.

NAT counting

Number of times the NAT rule is matched.

Config status

Status of the static NAT mapping: Active or Inactive.

Reasons for inactive status

Reasons why the static NAT mapping does not take effect. This field is available when the Config status is Inactive.

Related commands

nat static enable

nat static inbound

nat static inbound net-to-net

nat static outbound

nat static outbound net-to-net

display nat statistics

Use display nat statistics to display NAT statistics.

Syntax

In standalone mode:

display nat statistics [ summary ]

In IRF mode:

display nat statistics [ summary ] [ slot slot-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

summary: Displays NAT statistics summary. If you do not specify this keyword, this command displays detailed NAT statistics.

slot slot-number: Specifies an IRF member device by its member ID. If you do not specify a member device, this command displays NAT statistics for all member devices. (In IRF mode.)

Examples

# (In standalone mode.) Display detailed information about NAT statistics.

<Sysname> display nat statistics

Slot 0:

  Session creation rate: 0

  Total session entries: 100

  Total EIM entries: 1

  Total inbound NO-PAT entries: 0

  Total outbound NO-PAT entries: 0

  Total static port block entries: 10

  Total dynamic port block entries: 15

  Active static port block entries: 0

  Active dynamic port block entries: 0

# (In IRF mode.) Display detailed information about NAT statistics.

<Sysname> display nat statistics

Slot 1:

  Total session entries: 100

  Session creation rate: 0

  Total EIM entries: 1

  Total inbound NO-PAT entries: 0

  Total outbound NO-PAT entries: 0

  Total static port block entries: 10

  Total dynamic port block entries: 15

  Active static port block entries: 0

  Active dynamic port block entries: 0

Table 17 Command output

Field

Description

Total session entries

Number of NAT session entries.

Session creation rate

Number of NAT sessions created per second.

Total EIM entries

Total number of EIM entries.

Total inbound NO-PAT entries

Total number of inbound NO-PAT entries.

Total outbound NO-PAT entries

Total number of outbound NO-PAT entries.

Total static port block entries

Total number of static NAT444 mappings.

Total dynamic port block entries

Total number of dynamic port block mappings that can be created. It equals the number of port blocks for dynamic assignment, including the assigned and unassigned port blocks.

Active static port block entries

Number of static port block mappings that are in use.

Active dynamic port block entries

Number of dynamic port block mappings that have been created. It equals the number of dynamically assigned port blocks.

# (In standalone mode.) Display NAT statistics summary.

<Sysname> display nat statistics summary

EIM: Total EIM entries.

SPB: Total static port block entries.

DPB: Total dynamic port block entries.

ASPB: Active static port block entries.

ADPB: Active dynamic port block entries.

Slot Sessions  EIM       SPB       DPB       ASPB      ADPB

0    100       1         10        15        0         0

# (In IRF mode.) Display NAT statistics summary.

<Sysname> display nat statistics summary

EIM: Total EIM entries.

SPB: Total static port block entries.

DPB: Total dynamic port block entries.

ASPB: Active static port block entries.

ADPB: Active dynamic port block entries.

Slot Sessions  EIM       SPB       DPB       ASPB      ADPB

2    0         0         0         1572720   0         0

Table 18 Command output

Field

Description

Sessions

Number of NAT session entries.

EIM

Number of EIM entries.

SPB

Number of static NAT444 mappings.

DPB

Number of dynamic port block mappings that can be created. It equals the number of port blocks for dynamic assignment, including the assigned and unassigned port blocks.

ASPB

Number of static port block mappings in use.

ADPB

Number of dynamic port block mappings that have been created. It equals the number of dynamically assigned port blocks.

global-ip-pool

Use global-ip-pool to add a public IP address range to a NAT port block group.

Use undo global-ip-pool to remove a public IP address range from a NAT port block group.

Syntax

global-ip-pool start-address end-address

undo global-ip-pool start-address [ end-address ]

Default

No public IP address ranges exist.

Views

NAT port block group view

Predefined user roles

network-admin

Parameters

start-address end-address: Specifies the start IP address and end IP address of a public IP address range. The end IP address cannot be lower than the start IP address. If the start and end IP addresses are the same, only one public IP address is specified.

Usage guidelines

A static port block mapping maps a public IP address to multiple private IP addresses and assigns a unique port block to each private IP address. The number of port blocks that a public IP address can assign is determined by dividing the number of ports in the port range by the port block size.

Every time you execute this command, an address range can contain a maximum of 255 public IP addresses. All public IP address ranges in one port block group cannot overlap.

Public IP address ranges in different port block groups can overlap. The port ranges for overlapped public IP address ranges cannot overlap.

Examples

# Add a public IP address range to the port block group 1. The public IP address range consists of IP addresses from 202.10.1.1 to 202.10.1.10.

<Sysname> system-view

[Sysname] nat port-block-group 1

[Sysname-port-block-group-1] global-ip-pool 202.10.1.1 202.10.1.10

Related commands

nat port-block-group

inside ip

Use inside ip to add a server to an internal server group.

Use undo inside ip to remove a server from an internal server group.

Syntax

inside ip inside-ip port port-number [ weight weight-value ]

undo inside ip inside-ip port port-number

Default

An internal server group has no server members.

Views

Internal server group view

Predefined user roles

network-admin

Parameters

inside-ip: Specifies the IP address of an internal server.

port port-number: Specifies the port number of an internal server, in the range of 1 to 65535, excluding FTP port 20.

weight weight-value: Specifies the weight of the internal server. The value range is 1 to 1000, and the default value is 100.

Usage guidelines

An internal server with a larger weight receives a larger percentage of connections in the internal server group.

Examples

# Add a server with IP address 10.1.1.2 and port number 30 to internal server group 1.

<Sysname> system-view

[Sysname] nat server-group 1

[Sysname-nat-server-group-1] inside ip 10.1.1.2 port 30

Related commands

nat server-group

local-ip-address

Use local-ip-address to add a private IP address range to a NAT port block group.

Use undo local-ip-address to remove a private IP address range from a NAT port block group.

Syntax

local-ip-address start-address end-address

undo local-ip-address start-address [ end-address ]

Default

No private IP address ranges exist in a NAT port block group.

Views

NAT port block group view

Predefined user roles

network-admin

Parameters

start-address end-address: Specifies the start IP address and end IP address of a private IP address range. The end IP address cannot be lower than the start IP address. If the start and end IP addresses are the same, only one private IP address is specified.

Usage guidelines

A static port block mapping maps one public IP address to multiple private IP addresses and assigns a unique port block to each private IP address.

In a NAT port block group, the number of private IP addresses cannot be larger than the number of assignable port blocks. Otherwise, some private IP addresses cannot obtain port blocks. The number of port blocks that a public IP address can assign is determined by dividing the number of ports in the port range by the port block size.

Examples

# Add a private IP address range to port block group 1. The private IP address range consists of IP addresses from 172.16.1.1 to 172.16.1.255.

<Sysname> system-view

[Sysname] nat port-block-group 1

[Sysname-port-block-group-1] local-ip-address 172.16.1.1 172.16.1.255

Related commands

nat port-block-group

nat address-group

Use nat address-group to create a NAT address group and enter its view, or enter the view of an existing NAT address group.

Use undo nat address-group to delete a NAT address group.

Syntax

nat address-group group-id [ name group-name ]

undo nat address-group group-id

Default

No NAT address groups exist.

Views

System view

Predefined user roles

network-admin

Parameters

group-id: Specifies the ID of a NAT address group. The value range for this argument is 0 to 65535.

name group-name: Assigns a name to the NAT address group. The group-name argument is a case-sensitive string of 1 to 63 characters.

Usage guidelines

A NAT address group is a set of address ranges. Use the address command to add an address range to a NAT address group. Dynamic NAT translates the source IP address of a packet into an IP address in the address group.

Examples

# Create a NAT address group numbered 1 and named abc.

<Sysname> system-view

[Sysname] nat address-group 1 name abc

Related commands

address

display nat address-group

display nat all

nat inbound

nat outbound

nat alg

Use nat alg to enable NAT ALG for the specified or all supported protocols.

Use undo nat alg to disable NAT ALG for the specified or all supported protocols.

Syntax

nat alg { all | dns | ftp | h323 | icmp-error | ils | mgcp | nbt | pptp | rsh | rtsp | sccp | sip | sqlnet | tftp | xdmcp }

undo nat alg { all | dns | ftp | h323 | icmp-error | ils | mgcp | nbt | pptp | rsh | rtsp | sccp | sip | sqlnet | tftp | xdmcp }

Default

NAT ALG is enabled for DNS, FTP, ICMP error messages, RTSP, and PPTP, and is disabled for the other supported protocols.

Views

System view

Predefined user roles

network-admin

Parameters

all: Enables NAT ALG for all supported protocols.

dns: Enables NAT ALG for DNS.

ftp: Enables NAT ALG for FTP.

h323: Enables NAT ALG for H.323.

icmp-error: Enables NAT ALG for ICMP error packets.

ils: Enables NAT ALG for ILS.

mgcp: Enables NAT ALG for MGCP.

nbt: Enables NAT ALG for NBT.

pptp: Enables NAT ALG for PPTP.

rsh: Enables NAT ALG for RSH.

rtsp: Enables NAT ALG for RTSP.

sccp: Enables NAT ALG for SCCP.

sip: Enables NAT ALG for SIP.

sqlnet: Enables NAT ALG for SQLNET.

tftp: Enables NAT ALG for TFTP.

xdmcp: Enables NAT ALG for XDMCP.

Usage guidelines

NAT ALG translates address or port information in the application layer payload to ensure connection establishment.

For example, an FTP application includes a data connection and a control connection. The IP address and port number for the data connection depend on the payload information of the control connection. This requires NAT ALG to translate the address and port information to establish the data connection.

Examples

# Enable NAT ALG for FTP.

<Sysname> system-view

[Sysname] nat alg ftp

Related commands

display nat all

nat dns-map

Use nat dns-map to configure a NAT DNS mapping.

Use undo nat dns-map to remove a NAT DNS mapping.

Syntax

nat dns-map domain domain-name protocol pro-type { interface interface-type interface-number | ip global-ip } port global-port

undo nat dns-map domain domain-name

Default

No NAT DNS mappings exist.

Views

System view

Predefined user roles

network-admin

Parameters

domain domain-name: Specifies the domain name of an internal server. A domain name is a dot-separated case-insensitive string that can include letters, digits, hyphens (-), underscores (_), and dots (.) (for example, aabbcc.com). The domain name can contain a maximum of 253 characters, and each separated string contains no more than 63 characters.

protocol pro-type: Specifies the type of the protocol used by the internal server, tcp or udp.

interface interface-type interface-number: Enables Easy IP to use the IP address of the interface specified by its type and number as the public address of the internal server.

ip global-ip: Specifies the public IP address used by the internal server to provide services for the external network.

port global-port: Specifies the public port number used by the internal server to provide services for the external network. The port number format can be one of the following:

·     A number in the range of 1 to 65535.

·     A protocol name, a string of 1 to 15 characters. For example, ftp and telnet.

Usage guidelines

NAT DNS mapping must cooperate with the NAT Server feature.

·     A NAT DNS mapping maps the domain name of an internal server to the public IP address, public port number, and protocol type of the internal server.

·     A NAT server mapping maps the public IP and port to the private IP and port of the internal server.

The cooperation allows an internal host to access an internal server on the same private network by using the domain name of the internal server when the DNS server is on the public network. The DNS reply from the external DNS server contains only the domain name and public IP address of the internal server in the payload. The NAT interface might have multiple internal servers configured with the same public IP address but different private IP addresses. DNS ALG might find an incorrect internal server by using only the public IP address. If a DNS mapping is configured, DNS ALG can obtain the public IP address, public port number, and protocol type of the internal server by using the domain name. Then it can find the correct internal server by using the public IP address, public port number, and protocol type of the internal server.

You can configure multiple NAT DNS mappings.

Examples

# Configure a NAT DNS mapping to map the domain name www.server.com to the public IP address 202.112.0.1, public port number 12345, and protocol type TCP.

<Sysname> system-view

[Sysname] nat dns-map domain www.server.com protocol tcp ip 202.112.0.1 port 12345

Related commands

display nat all

display nat dns-map

nat server

nat icmp-error reply

Use nat icmp-error reply to enable sending ICMP error messages upon NAT failures.

Use undo nat icmp-error reply to restore the default.

Syntax

nat icmp-error reply

undo nat icmp-error reply

Default

No ICMP error messages are sent upon NAT failures.

Views

System view

Predefined user roles

network-admin

Usage guidelines

Disabling sending ICMP error messages upon NAT failures reduces useless packets, saves bandwidth, and avoids exposing the device IP address to the public network.

This command is required for traceroute.

Examples

# Enable sending ICMP error messages upon NAT failures.

<Sysname> system-view

[Sysname] nat icmp-error reply

nat inbound

Use nat inbound to configure an inbound dynamic NAT rule.

Use undo nat inbound to delete an inbound dynamic NAT rule.

Syntax

nat inbound { ipv4-acl-number | name ipv4-acl-name } address-group { group-id | name group-name } [ no-pat [ reversible ] [ add-route ] ] [ rule rule-name ] [ priority priority ] [ disable ] [ description text ] [ counting ]

undo nat inbound { ipv4-acl-number | name ipv4-acl-name }

Default

No inbound dynamic NAT rules exist.

Views

Interface view

Predefined user roles

network-admin

Parameters

ipv4-acl-number: Specifies an ACL by its number in the range of 2000 to 3999.

name ipv4-acl-name: Specifies an ACL by its name, a case-insensitive string of 1 to 63 characters. The ACL name must start with an English letter and to avoid confusion, it cannot be all.

address-group group-id: Specifies an address group for address translation.

group-id: Specifies the address group ID. The value range for this argument is 0 to 65535.

name group-name: Specifies the address group name, a case-insensitive string of 1 to 63 characters.

no-pat: Uses the NO-PAT mode. If you do not specify this keyword, PAT is used. PAT supports only TCP, UDP, and ICMP query packets. For an ICMP packet, the ICMP ID is used as its source port number.

reversible: Enables reverse address translation. Reverse address translation uses existing NO-PAT entries to translate the destination address for connections actively initiated from the internal network to the external network.

add-route: Automatically adds a route to the source address after translation. The output interface is the NAT interface and the next hop is the source address before translation.

rule rule-name: Specifies a name for the rule, a case-sensitive string of 1 to 63 characters. It cannot contain backward slashes (\), forward slashes (/), colons (:), asterisks (*), question marks (?), left angle brackets (<), right angle brackets (>), vertical bars (|), quotation marks ("), or at signs (@). If you do not specify this option, the rule does not have a name.

priority priority: Specifies a priority for the rule, in the range of 0 to 2147483647. A smaller value represents a higher priority. If you do not specify this option, the rule has the lowest priority among the same type of NAT rules.

disable: Disables the inbound dynamic NAT rule. If you do not specify this keyword, the rule is enabled.

description text: Specifies a description for the inbound dynamic NAT rule. The text argument is a case-insensitive string of 1 to 63 characters.

counting: Enables NAT counting. The number of flows that use the address mapping is counted.

Usage guidelines

Inbound dynamic NAT translates the source IP addresses of incoming packets permitted by the ACL into IP addresses in the address group.

Inbound dynamic NAT supports the following modes:

·     PAT—Performs both IP address translation and port translation.

·     NO-PAT—Performs only IP address translation.

The NO-PAT mode supports reverse address translation. Reverse address translation uses ACL reverse matching to identify packets to be translated. ACL reverse matching works as follows:

·     Compares the source IP address/port of a packet with the destination IP addresses/ports in the ACL.

·     Translates the destination IP address of the packet according to the matching NO-PAT entry, and then compares the translated destination IP address/port with the source IP addresses/ports in the ACL.

Inbound dynamic NAT typically cooperates with one of the following to implement bidirectional NAT:

·     Outbound dynamic NAT (the nat outbound command).

·     NAT Server (the nat server command).

·     Outbound static NAT (the nat static command).

An address group cannot be used by both the nat inbound and nat outbound commands. It cannot be used by the nat inbound command in both PAT and NO-PAT modes.

Do not specify the add-route keyword if the subnets where the internal and external networks reside overlap. For other network scenarios:

·     If you specify the add-route keyword, the device automatically adds a route to the source address after translation for a packet. The destination address is the NATed address in the NAT address group, the output interface is the interface where the command is executed, and the next hop is the source address before translation.

·     If you do not specify the add-route keyword, you must manually add the route. As a best practice, add routes manually because automatic route adding is slow.

An ACL can be used by only one inbound dynamic NAT rule on an interface.

You can configure multiple inbound dynamic NAT rules on an interface.

Inbound dynamic NAT rules configured with the same priority value are matched by using their ACLs.

·     NAT rules with named ACLs have higher priorities than NAT rules with unnamed ACLs.

·     NAT rules with named ACLs are matched in alphabetical order of their ACL names.

·     NAT rules with unnamed ACLs are matched in descending order of their ACL numbers.

Examples

# Configure ACL 2001 to permit packets only from subnet 10.110.10.0/24 to pass through.

<Sysname> system-view

[Sysname] acl basic 2001

[Sysname-acl-ipv4-basic-2001] rule permit source 10.110.10.0 0.0.0.255

[Sysname-acl-ipv4-basic-2001] rule deny

[Sysname-acl-ipv4-basic-2001] quit

# Create address group 1 and add the address range of 202.110.10.10 to 202.110.10.12 to the group.

[Sysname] nat address-group 1

[Sysname-address-group-1] address 202.110.10.10 202.110.10.12

[Sysname-address-group-1] quit

# Configure an inbound NO-PAT rule on interface VLAN-interface 10. NAT translates the source addresses of incoming packets into the addresses in address group 1, and automatically adds routes for translated packets. Set the rule name to abc, and the priority to 0.

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] nat inbound 2001 address-group 1 no-pat add-route rule abc priority 0

Related commands

display nat all

display nat inbound

display nat no-pat

nat inbound rule move

Use nat inbound rule move to change the priority of an inbound dynamic NAT rule.

Syntax

nat inbound rule move nat-rule-name1 { after | before } nat-rule-name2

Views

Interface view

Predefined user roles

network-admin

Parameters

nat-rule-name1: Specifies the name of the rule be moved.

after: Moves the rule nat-rule-name1 to the line after the rule nat-rule-name2 (called the reference rule). The priority value of the reference rule is not changed. The priority value of the moved rule equals the priority value of the reference rule plus one.

before: Moves the rule nat-rule-name1 to the line before the rule nat-rule-name2. The priority value of the reference rule is not changed. The priority value of the moved rule equals the priority value of the reference rule minus one.

nat-rule-name2: Specifies the name of the NAT rule as a reference rule for the NAT rule to be moved.

Usage guidelines

This command is applicable only to named inbound dynamic NAT rules.

A NAT rule appearing earlier on the rule list has a higher priority for packet matching.

Examples

# Move the inbound dynamic NAT rule abc to the line before the rule def.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] nat inbound rule move abc before def

Related commands

nat inbound

nat log alarm

Use nat log alarm to enable NAT alarm logging.

Use undo nat log alarm to disable NAT alarm logging.

Syntax

nat log alarm

undo nat log alarm

Default

NAT alarm logging is disabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

Packets that need to be translated are dropped if the NAT resources are not enough. In NO-PAT, the NAT resources refer to the public IP addresses. In EIM PAT, the NAT resources refer to public IP addresses and ports. In NAT444, the NAT resources refer to public IP addresses, port blocks, or ports in port blocks. NAT alarm logging monitors the usage of NAT resources and outputs logs if the NAT resources are not enough.

The NAT444 gateway generates alarm logs when the ports in the extended port blocks of a dynamic port block mapping are all occupied.

Before configuring alarm logging for NAT, you must configure the custom NAT log generation and outputting features. For more information about information center, see System Management Configuration Guide.

This command take effect only after you use the nat log enable command to enable NAT logging.

Examples

# Enable NAT alarm logging.

<Sysname> system-view

[Sysname] nat log alarm

Related commands

display nat all

display nat log

nat log enable

nat log enable

Use nat log enable to enable NAT logging.

Use undo nat log enable to disable NAT logging.

Syntax

nat log enable [ acl { ipv4-acl-number | name ipv4-acl-name } ]

undo nat log enable

Default

NAT logging is disabled.

Views

System view

Predefined user roles

network-admin

Parameters

acl: Specifies an ACL.

ipv4-acl-number: Specifies an ACL by its number in the range of 2000 to 3999.

name ipv4-acl-name: Specifies an ACL by its name, a case-insensitive string of 1 to 63 characters. The ACL name must start with an English letter and to avoid confusion, it cannot be all.

Usage guidelines

You must enable NAT logging before you enable NAT session logging, NAT444 user logging (including port block assignment and withdrawal logging), NAT alarm logging, or NAT NO-PAT logging.

The acl keyword takes effect only for NAT session logging. If an ACL is specified, flows matching the permit rule might trigger NAT session logs. If you do not specify an ACL, all flows processed by NAT might trigger NAT session logs.

Examples

# Enable NAT logging.

<Sysname> system-view

[Sysname] nat log enable

Related commands

display nat all

display nat log

nat log alarm

nat log flow-active

nat log flow-begin

nat log flow-end

·     nat log port-block-assign

·     nat log port-block-withdraw

nat log flow-active

Use nat log flow-active to enable logging for active NAT flows and set the logging interval.

Use undo nat log flow-active to disable logging for active NAT flows.

Syntax

nat log flow-active time-value

undo nat log flow-active

Default

Logging for active NAT flows is disabled.

Views

System view

Predefined user roles

network-admin

Parameters

time-value: Specifies the interval for logging active NAT flows, in the range of 10 to 120 minutes.

Usage guidelines

Active NAT flows are NAT sessions that last for a long time. The logging feature helps track active NAT flows by periodically logging the active NAT flows.

Logging for active NAT flows takes effect only after you enable NAT logging.

Examples

# Enable logging for active NAT flows and set the logging interval to 10 minutes.

<Sysname> system-view

[Sysname] nat log flow-active 10

Related commands

display nat all

display nat log

nat log enable

nat log flow-begin

Use nat log flow-begin to enable logging for NAT session establishment events.

Use undo nat log flow-begin to disable logging for NAT session establishment events.

Syntax

nat log flow-begin

undo nat log flow-begin

Default

Logging for NAT session establishment events is disabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

Logging for NAT session establishment events takes effect only after you enable NAT logging.

Examples

# Enable logging for NAT session establishment events.

<Sysname> system-view

[Sysname] nat log flow-begin

Related commands

display nat all

display nat log

nat log enable

nat log flow-end

Use nat log flow-end to enable logging for NAT session removal events.

Use undo nat log flow-end to disable logging for NAT session removal events.

Syntax

nat log flow-end

undo nat log flow-end

Default

Logging for NAT session removal events is disabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

Logging for NAT session removal events takes effect only after you enable NAT logging.

Examples

# Enable logging for NAT session removal events.

<Sysname> system-view

[Sysname] nat log flow-end

Related commands

display nat all

display nat log

nat log enable

nat log port-block usage threshold

Use nat log port-block usage threshold to set the port block usage threshold.

Use undo nat log port-block port-usage threshold to restore the default.

Syntax

nat log port-block usage threshold value

undo nat log port-block usage threshold

Default

The port block usage threshold is 90%.

Views

System view

Predefined user roles

network-admin

Parameters

value: Specifies a threshold in the range of 40 to 100 in percentage.

Usage guidelines

A log is generated when the port block usage exceeds the threshold.

Examples

# Set the port block usage threshold to 60%.

<Sysname> system-view

[Sysname] nat log port-block usage threshold 60

Related commands

display nat all

display nat log

nat log enable

nat log port-block-assign

Use nat log port-block-assign to enable NAT444 user logging for port block assignment.

Use undo nat log port-block-assign to disable NAT444 user logging for port block assignment.

Syntax

nat log port-block-assign

undo nat log port-block-assign

Default

NAT444 user logging is disabled for port block assignment.

Views

System view

Predefined user roles

network-admin

Usage guidelines

For static port block mappings, the NAT444 gateway generates a user log when it translates the first connection from a private IP address.

For dynamic port block mappings, the NAT444 gateway generates a user log when it assigns or extends a port block for a private IP address.

This command takes effect only after you use the nat log enable command to enable NAT logging.

Examples

# Enable NAT444 user logging for port block assignment.

<Sysname> system-view

[Sysname] nat log port-block-assign

Related commands

display nat all

display nat log

nat log enable

nat log port-block-withdraw

Use nat log port-block-withdraw to enable NAT444 user logging for port block withdrawal.

Use undo nat log port-block-withdraw to disable NAT444 user logging for port block withdrawal.

Syntax

nat log port-block-withdraw

undo nat log port-block-withdraw

Default

NAT444 user logging is disabled for port block withdrawal.

Views

System view

Predefined user roles

network-admin

Usage guidelines

For static port block mappings, the NAT444 gateway generates a user log when all connections from a private IP address are disconnected.

For dynamic port block mappings, the NAT444 gateway generates a user log when all the following conditions are met:

·     The port blocks (including the extended ones) assigned to the private IP address are withdrawn.

·     The corresponding mapping entry is deleted.

This command takes effect only after you use the nat log enable command to enable NAT logging.

Examples

# Enable NAT444 user logging for port block withdrawal.

<Sysname> system-view

[Sysname] nat log port-block-withdraw

Related commands

display nat all

display nat log

nat log enable

nat mapping-behavior endpoint-independent

Use nat mapping-behavior endpoint-independent to specify the Endpoint-Independent Mapping (EIM) mode for PAT.

Use undo nat mapping-behavior to restore the default.

Syntax

nat mapping-behavior endpoint-independent [ acl { ipv4-acl-number | name ipv4-acl-name } ]

undo nat mapping-behavior endpoint-independent

Default

Address and Port-Dependent Mapping applies.

Views

System view

Predefined user roles

network-admin

Parameters

acl: Specifies an ACL to define the applicable scope of Endpoint-Independent Mapping.

ipv4-acl-number: Specifies an ACL by its number in the range of 2000 to 3999.

name ipv4-acl-name: Specifies an ACL by its name, a case-insensitive string of 1 to 63 characters. The ACL name must start with an English letter and to avoid confusion, it cannot be all.

Usage guidelines

PAT supports the following NAT mapping modes:

·     Endpoint-Independent Mapping—Uses the same IP and port mapping (EIM entry) for packets from the same source and port to any destination. EIM allows external hosts to access the internal hosts by using the translated IP address and port. It allows internal hosts behind different NAT gateways to access each other.

·     Address and Port-Dependent Mapping—Uses different IP and port mappings for packets with the same source IP and port to different destination IP addresses and ports. APDM allows an external host to access an internal host only under the condition that the internal host has previously accessed the external host. It is secure, but it does not allow internal hosts behind different NAT gateways to access each other.

This command takes effect only on outbound PAT. Address and Port-Dependent Mapping always applies to inbound PAT.

If you specify an ACL, Endpoint-Independent Mapping applies to packets that are permitted by the ACL. If you do not specify an ACL, Endpoint-Independent Mapping applies to all packets.

Examples

# Apply the Endpoint-Independent Mapping mode to all packets for address translation.

<Sysname> system-view

[Sysname] nat mapping-behavior endpoint-independent

# Apply the Endpoint-Independent Mapping mode to FTP and HTTP packets, and the Address and Port-Dependent Mapping mode to other packets for address translation.

<Sysname> system-view

[Sysname] acl advanced 3000

[Sysname-acl-ipv4-adv-3000] rule permit tcp destination-port eq 80

[Sysname-acl-ipv4-adv-3000] rule permit tcp destination-port eq 21

[Sysname-acl-ipv4-adv-3000] quit

[Sysname] nat mapping-behavior endpoint-independent acl 3000

Related commands

nat outbound

display nat eim

nat outbound

Use nat outbound to configure an outbound dynamic NAT rule.

Use undo nat outbound to delete an outbound dynamic NAT rule.

Syntax

NO-PAT:

nat outbound [ ipv4-acl-number | name ipv4-acl-name ] address-group { group-id | name group-name } no-pat [ reversible ] [ rule rule-name ] [ priority priority ] [ disable ] [ description text ] [ counting ]

undo nat outbound [ ipv4-acl-number | name ipv4-acl-name ]

PAT:

nat outbound [ ipv4-acl-number | name ipv4-acl-name ] [ address-group { group-id | name group-name } ] [ port-preserved ] [ rule rule-name ] [ priority priority ] [ disable ] [ description text ] [ counting ]

undo nat outbound [ ipv4-acl-number | name ipv4-acl-name ]

Default

No outbound dynamic NAT rules exist.

Views

Interface view

Predefined user roles

network-admin

Parameters

ipv4-acl-number: Specifies an ACL by its number in the range of 2000 to 3999.

name ipv4-acl-name: Specifies an ACL by its name, a case-insensitive string of 1 to 63 characters. The ACL name must start with an English letter and to avoid confusion, it cannot be all.

address-group: Specifies an address group for NAT. If you do not specify an address group, the IP address of the interface is used as the NAT address. Easy IP is used.

group-id: Specifies the address group ID. The value range for this argument is 0 to 65535.

name group-name: Specifies the address group name, a case-insensitive string of 1 to 63 characters.

no-pat: Uses the NO-PAT mode. If you do not specify this keyword, PAT is used. PAT only supports TCP, UDP, and ICMP query packets. For an ICMP packet, the ICMP ID is used as its source port number.

reversible: Enables reverse address translation. Reverse address translation uses existing NO-PAT entries to translate the destination address for connections actively initiated from the external network to the internal network.

port-preserved: Tries to preserve port number for PAT. This keyword does not take effect on dynamic NAT port block mapping.

rule rule-name: Specifies a name for the rule, a case-sensitive string of 1 to 63 characters. It cannot contain backward slashes (\), forward slashes (/), colons (:), asterisks (*), question marks (?), left angle brackets (<), right angle brackets (>), vertical bars (|), quotation marks ("), or at signs (@). If you do not specify this option, the rule does not have a name.

priority priority: Specifies a priority for the rule, in the range of 0 to 2147483647. A smaller value represents a higher priority. If you do not specify this option, the rule has the lowest priority among the same type of NAT rules.

disable: Disables the outbound dynamic NAT rule. If you do not specify this keyword, the rule is enabled.

description text: Specifies a description for the outbound dynamic NAT rule. The text argument is a case-insensitive string of 1 to 63 characters.

counting: Enables NAT counting. The number of flows that use the address mapping is counted.

Usage guidelines

Outbound dynamic NAT is typically configured on the interface connected to the external network. You can configure multiple outbound dynamic NAT rules on an interface.

Outbound dynamic NAT supports the following modes:

·     PAT—Performs both IP address translation and port translation. The PAT mode allows external hosts to actively access the internal hosts if the Endpoint-Independent Mapping behavior is used.

·     NO-PAT—Performs only IP address translation. The NO-PAT mode allows external hosts to actively access the internal hosts if you specify the reversible keyword. If an ACL is specified, reverse address translation only applies to packets permitted by ACL reverse matching. ACL reverse matching works as follows:

¡     Compares the source IP address/port of a packet with the destination IP addresses/ports in the ACL.

¡     Translates the destination IP address of the packet according to the matching NO-PAT entry, and then compares the translated destination IP address/port with the source IP addresses/ports in the ACL.

Dynamic NAT444 does not support the NO-PAT mode.

When you specify a NAT address group, follow these restrictions and guidelines:

·     An address group cannot be used by both the nat inbound and nat outbound commands.

·     An address group cannot be used by the nat outbound command in both PAT and NO-PAT modes.

·     When port block parameters are specified in the NAT address group, this command configures a dynamic NAT port block mapping. Packets matching the ACL permit rule are processed by dynamic NAT444.

When you specify an ACL, follow these restrictions and guidelines:

·     An ACL can be used by only one outbound dynamic NAT rule on an interface.

·     If you specify an ACL, NAT translates the source IP addresses of outgoing packets permitted by the ACL into IP addresses in the address group. If you do not specify an ACL, NAT translates all packets.

·     Outbound dynamic NAT rules with ACLs configured on an interface takes precedence over those without ACLs. If two ACL-based dynamic NAT rules are configured, the rule with the higher ACL number has higher priority.

Outbound dynamic NAT rules configured with the same priority value and an ACL are matched by using the ACLs in the rule.

·     NAT rules with named ACLs have higher priorities than NAT rules with unnamed ACLs.

·     NAT rules with named ACLs are matched in alphabetical order of their ACL names.

·     NAT rules with unnamed ACLs are matched in descending order of their ACL numbers.

Examples

# Configure ACL 2001 to permit packets only from subnet 10.110.10.0/24 to pass through.

<Sysname> system-view

[Sysname] acl basic 2001

[Sysname-acl-ipv4-basic-2001] rule permit source 10.110.10.0 0.0.0.255

[Sysname-acl-ipv4-basic-2001] rule deny

[Sysname-acl-ipv4-basic-2001] quit

# Create address group 1 and add the address range of 202.110.10.10 to 202.110.10.12 to the group.

[Sysname] nat address-group 1

[Sysname-address-group-1] address 202.110.10.10 202.110.10.12

[Sysname-address-group-1] quit

# Configure an outbound dynamic PAT rule on interface VLAN-interface 10 to translate the source addresses of outgoing packets permitted by ACL 2001 into the addresses in address group 1.

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] nat outbound 2001 address-group 1

[Sysname-Vlan-interface10] quit

Or

# Configure an outbound NO-PAT rule on interface VLAN-interface 10 to translate the source addresses of outgoing packets permitted by ACL 2001 into the addresses in address group 1.

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] nat outbound 2001 address-group 1 no-pat

[Sysname-Vlan-interface10] quit

Or

# Enable Easy IP to use the IP address of VLAN-interface 10 as the translated address.

[Sysname] interface Vlan-interface 10

[Sysname-Vlan-interface10] nat outbound 2001

[Sysname-Vlan-interface10] quit

Or

# Configure an outbound NO-PAT rule on VLAN-interface 10 to translate the source addresses of outgoing packets permitted by ACL 2001 into the addresses in address group 1. Enable reverse address translation.

[Sysname] interface Vlan-interface 10

[Sysname-Vlan-interface10] nat outbound 2001 address-group 1 no-pat reversible

Related commands

display nat eim

display nat outbound

nat mapping-behavior

nat outbound port-block-group

Use nat outbound port-block-group to configure a static outbound port block mapping rule on an interface.

Use undo nat outbound port-block-group to delete a static port block mapping rule on an interface.

Syntax

nat outbound port-block-group group-id [ rule rule-name ] [ counting ]

undo nat outbound port-block-group group-id

Default

No static outbound port block mapping rule is configured on an interface.

Views

Interface view

Predefined user roles

network-admin

Parameters

group-id: Specifies a NAT port block group by its ID. The value range for this argument is 0 to 65535.

rule rule-name: Specifies a name for the rule, a case-sensitive string of 1 to 63 characters. It cannot contain backward slashes (\), forward slashes (/), colons (:), asterisks (*), question marks (?), left angle brackets (<), right angle brackets (>), vertical bars (|), quotation marks ("), or at signs (@). If you do not specify this option, the rule does not have a name.

counting: Enables NAT counting. The number of flows that use the address mapping is counted.

Usage guidelines

After you configure this command on an interface, the system automatically computes the mappings and creates entries for them. When a private IP address accesses the public network, the private IP address is translated to the mapped public IP address, and the ports are translated to ports in the selected port block.

You can configure multiple port block mapping rules on an interface.

Examples

# Configure a static outbound port block mapping rule on VLAN-interface 10, and specify the rule name as abc.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] nat outbound port-block-group 1 rule abc

Related commands

display nat all

display nat outbound port-block-group

display nat port-block

nat port-block-group

nat outbound rule move

Use nat outbound rule move to change the priority of an outbound dynamic NAT rule.

Syntax

nat outbound rule move nat-rule-name1 { after | before } nat-rule-name2

Views

Interface view

Predefined user roles

network-admin

Parameters

nat-rule-name1: Specifies the name of the NAT rule to be moved.

after: Moves the rule nat-rule-name1 to the line after the rule nat-rule-name2 (called the reference rule). The priority value of the reference rule is not changed. The priority value of the moved rule equals the priority value of the reference rule plus one.

before: Moves the rule nat-rule-name1 to the line before the rule nat-rule-name2. The priority value of the reference rule is not changed. The priority value of the moved rule equals the priority value of the reference rule minus one.

nat-rule-name2: Specifies the name of the NAT rule as a reference rule for the NAT rule to be moved.

Usage guidelines

This command is applicable only to named outbound dynamic NAT rules.

A NAT rule appearing earlier on the rule list has a higher priority for packet matching.

Examples

# Move the outbound dynamic NAT rule abc to the line before the rule def.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] nat outbound rule move abc before def

Related commands

nat outbound

nat port-block global-share enable

Use nat port-block global-share enable to enable port block global sharing.

Use undo nat port-block global-share enable to disable port block global sharing.

Syntax

nat port-block global-share enable

undo nat port-block global-share enable

Default

Port block global sharing is disabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

When multiple interfaces have dynamic NAT port block mapping configured, the interfaces might create different port block mappings for packets from the same IP address. You can use this command to configure the interfaces to use the same port block mapping for translating packets from the same IP address.

Examples

# Enable port block global sharing.

<Sysname> system-view

[Sysname] nat port-block global-share enable

Related commands

port-block

nat port-block-group

Use nat port-block-group to create a NAT port block group and enter its view, or enter the view of an existing NAT port block group.

Use undo nat port-block-group to delete a NAT port block group.

Syntax

nat port-block-group group-id

undo nat port-block-group group-id

Default

No NAT port block groups exist.

Views

System view

Predefined user roles

network-admin

Parameters

group-id: Assigns an ID to the NAT port block group. The value range for this argument is 0 to 65535.

Usage guidelines

A NAT port block group is configured to implement static port block mapping for NAT444.

You must configure the following items for a NAT port block group:

·     A minimum of one private IP address range (see the local-ip-address command).

·     A minimum of one public IP address range (see the global-ip-address command).

·     A port range (see the port-range command).

·     A port block size (see the block-size command).

The system computes static port block mappings according to the port block group configuration, and creates entries for the mappings.

Examples

# Create NAT port block group 1.

<Sysname>system-view

[Sysname]nat port-block-group 1

[Sysname-port-block-group-1]

Related commands

block-size

display nat all

display nat port-block-group

global-ip-pool

local-ip-address

nat outbound port-block-group

port-range

nat server

Use nat server to create a NAT server mapping (also called NAT server rule). The mapping maps the private IP address and port of an internal server to a public address and port.

Use undo nat server to delete a NAT server mapping.

Syntax

Common NAT server mapping:

·     A single public address with no or a single public port:

nat server [ protocol pro-type ] global { global-address | current-interface | interface interface-type interface-number } [ global-port ] inside local-address [ local-port ] [ acl { ipv4-acl-number | name ipv4-acl-name } ] [ reversible ] [ rule rule-name ] [ disable ] [ counting ]

undo nat server [ protocol pro-type ] global { global-address | current-interface | interface interface-type interface-number } [ global-port ]

·     A single public address with consecutive public ports:

nat server protocol pro-type global { global-address | current-interface | interface interface-type interface-number } global-port1 global-port2 inside { { local-address | local-address1 local-address2 } local-port | local-address local-port1 local-port2 } [ acl { ipv4-acl-number | name ipv4-acl-name } ] [ rule rule-name ] [ disable ] [ counting ]

undo nat server protocol pro-type global { global-address | current-interface | interface interface-type interface-number } global-port1 global-port2

·     Consecutive public addresses with no or a single public port:

nat server protocol pro-type global global-address1 global-address2 [ global-port ] inside { local-address | local-address1 local-address2 } [ local-port ] [ acl { ipv4-acl-number | name ipv4-acl-name } ] [ rule rule-name ] [ disable ] [ counting ]

undo nat server protocol pro-type global global-address1 global-address2 [ global-port ]

·     Consecutive public addresses with a single public port:

nat server protocol pro-type global global-address1 global-address2 global-port inside local-address local-port1 local-port2 [ acl { ipv4-acl-number | name ipv4-acl-name } ] [ rule rule-name ] [ disable ] [ counting ]

undo nat server protocol pro-type global global-address1 global-address2 global-port

Load sharing NAT server mapping:

nat server protocol pro-type global { { global-address | current-interface | interface interface-type interface-number } { global-port | global-port1 global-port2 } | global-address1 global-address2 global-port } inside server-group group-id [ acl { ipv4-acl-number | name ipv4-acl-name } ] [ rule rule-name ] [ disable ] [ counting ]

undo nat server protocol pro-type global { { global-address | current-interface | interface interface-type interface-number } { global-port | global-port1 global-port2 } | global-address1 global-address2 global-port }

ACL-based NAT server mapping:

nat server global { ipv4-acl-number | name ipv4-acl-name } inside local-address [ local-port ] [ rule rule-name ] [ priority priority ] [ disable ] [ description text ] [ counting ]

undo nat server global { ipv4-acl-number | name ipv4-acl-name }

Default

No NAT server mappings exist.

Views

Interface view

Predefined user roles

network-admin

Parameters

protocol pro-type: Specifies a protocol type. When the protocol is TCP or UDP, NAT Server can be configured with port information. If you do not specify a protocol type, the command applies to packets of all protocols. The protocol type format can be one of the following:

·     A number in the range of 1 to 255.

·     A protocol name of icmp, tcp, or udp.

global: Specifies the public network information about the internal server.

global-address: Specifies the public address of an internal server.

global-address1 global address2: Specifies a public IP address range, which can include a maximum of 10000 addresses. The global-address1 argument specifies the start address, and the global address2 argument specifies the end address that must be greater than the start address.

ipv4-acl-number: Specifies an ACL by its number in the range of 2000 to 3999.

name ipv4-acl-name: Specifies an ACL by its name, a case-insensitive string of 1 to 63 characters. The ACL name must start with an English letter and to avoid confusion, it cannot be all.

current-interface: Enables Easy IP on the current interface. The primary IP address of the interface is used as the public address for the internal server.

interface interface-type interface-number: Enables Easy IP on the interface specified by its type and number. The primary IP address of the interface is used as the public address for the internal server. Only loopback interfaces are supported.

global-port1 global-port2: Specifies a public port number range, which can include a maximum of 10000 ports. The global-port1 argument specifies the start port, and the global-port2 argument specifies the end port that must be greater than the start port. The public port number format can be one of the following:

·     A number in the range of 1 to 65535. Both the start port and the end port support this format.

·     A protocol name, a string of 1 to 15 characters. For example, http and telnet. Only the start port supports this format.

inside: Specifies the private network information about the internal server.

local-address1 local-address2: Specifies a private IP address range. The local-address1 argument specifies the start address, and the local-address2 argument specifies the end address that must be greater than the start address. The number of addresses in the range must equal the number of ports in the public port number range.

local-port: Specifies the private port number. The private port number format can be one of the following:

·     A number in the range of 1 to 65535, excluding FTP port 20.

·     A protocol name, a string of 1 to 15 characters. For example, http and telnet.

global-port: Specifies the public port number. The default value and value range are the same as those for the local-port argument.

local-address: Specifies the private IP address.

server-group group-id: Specifies the internal server group to which the internal server belongs. With this parameter, the load sharing NAT Server feature is configured. The group-id argument specifies the internal server group ID. The value range for the group-id argument is 0 to 65535.

acl: Specifies an ACL. If you specify an ACL, only packets permitted by the ACL can be translated by using the mapping.

ipv4-acl-number: Specifies an ACL by its number in the range of 2000 to 3999.

name ipv4-acl-name: Specifies an ACL by its name, a case-insensitive string of 1 to 63 characters. The ACL name must start with an English letter and to avoid confusion, it cannot be all.

reversible: Allows reverse address translation. Reverse address translation applies to connections actively initiated by internal servers to the external network. It translates the private IP addresses of the internal servers to their public IP addresses.

rule rule-name: Specifies a name for the mapping, a case-sensitive string of 1 to 63 characters. It cannot contain backward slashes (\), forward slashes (/), colons (:), asterisks (*), question marks (?), left angle brackets (<), right angle brackets (>), vertical bars (|), quotation marks ("), or at signs (@). If you do not specify this option, the mapping does not have a name.

priority priority: Specifies a priority for the mapping, in the range of 0 to 2147483647. A smaller value represents a higher priority. If you do not specify this option, the mapping has the lowest priority among the same type of NAT rules.

disable: Disables the NAT server mapping. If you do not specify this keyword, the mapping is enabled.

description text: Specifies a description for the mapping. The text argument is a case-insensitive string of 1 to 63 characters.

counting: Enables NAT counting. The number of flows that use the address mapping is counted.

Usage guidelines

You can configure the NAT server mapping to allow servers (such as Web, FTP, Telnet, POP3, and DNS servers) in the internal network to provide services for external users.

NAT server mappings are usually configured on the interface connected to the external network on a NAT device. By using the global-address and global-port arguments, external users can access the internal server at local-address and local-port. When the protocol type is not udp (protocol number 17) or tcp (protocol number 6), you can configure only one-to-one IP address mappings. The following table describes the address-port mappings between an external network and an internal network for NAT Server.

Table 19 Address-port mappings for NAT Server

External network

Internal network

One public address

One private address

One public address and one public port number

One private address and one private port number

One public address and N consecutive public port numbers

·     One private address and one private port number

·     N consecutive private addresses and one private port number

·     One private address and N consecutive private port numbers

N consecutive public addresses

·     One private address

·     N consecutive private addresses

N consecutive public addresses and one public port number

·     One private address and one private port number

·     N consecutive private addresses and one private port number

·     One private address and N consecutive private port numbers

One public address and one public port number

One internal server group

One public address and N consecutive public port numbers

N consecutive public addresses and one public port number

Public addresses matching an ACL

One private address

One private address and one private port

 The mapping of the protocol type, public address, and public port number must be unique for an internal server on an interface. This restriction also applies when Easy IP is used. The maximum number of NAT server mappings equals the number of public ports in the specified public port range.

As a best practice, do not configure Easy IP for multiple NAT server mappings by using the same interface.

If the IP address of an interface used by Easy IP changes and conflicts with the IP address of a NAT server mapping not using Easy IP, the Easy IP configuration becomes invalid. If the conflicting IP address is modified to another IP address or the NAT server mapping without Easy IP is removed, the Easy IP configuration takes effect.

When you configure a load sharing NAT server mapping, you must make sure a user uses the same public address and public port to access the same service on an internal server. For this purpose, make sure value N in the following mappings is equal to or less than the number of servers in the internal server group:

·     One public address and N consecutive public port numbers are mapped to one internal server group.

·     N consecutive public addresses and a public port number are mapped to one internal server group.

ACL-based NAT server mappings that are configured with the same priority value are matched by using the ACLs in their rules:

·     Mappings with named ACLs have higher priorities than mappings with unnamed ACLs.

·     Mappings with named ACLs are matched in alphabetical order of their ACL names.

·     Mappings with unnamed ACLs are matched in descending order of their ACL numbers.

An error message for a rollback failure when you perform a configuration rollback for an internal server in the following situation:

·     In the running configuration, the name of a NAT server mapping is assigned automatically by the system.

·     In the replacement configuration file, the name does not exist.

The system will compare the running configuration file and the replacement file, and display an error message about the mismatch. You can ignore the error message because the NAT server mapping configuration in the configuration file is installed successfully. For example, the NAT server mapping configuration is nat server global 112.1.1.1 inside 192.168.20.1 in the running configuration, and the is nat server global 112.1.1.1 inside 192.168.20.1 rule ServerRule_num in the replacement configuration file. After the rollback operation, the new NAT server configuration is successfully installed.

Examples

# Allow external users to access the internal Web server at 10.110.10.10 through http://202.110.10.10:8080.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] nat server protocol tcp global 202.110.10.10 8080 inside 10.110.10.10 http

[Sysname-Vlan-interface10] quit

# Configure an ACL-based NAT server mapping to allow users to use IP addresses in subnet 192.168.0.0/24 to access the internal server at 10.0.0.172.

<Sysname> system-view

[Sysname] acl advanced 3000

[Sysname-acl-ipv4-adv-3000] rule 5 permit ip destination 192.168.0.0 0.0.0.255

[Sysname-acl-ipv4-adv-3000] quit

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] nat server global 3000 inside 10.0.0.172

Related commands

display nat all

display nat server

nat server-group

nat server rule move

Use nat server rule move to change the priority of an ACL-based NAT server rule.

Syntax

nat server rule move nat-rule-name1 { after | before } nat-rule-name2

Views

Interface view

Predefined user roles

network-admin

Parameters

nat-rule-name1: Specifies the name of the NAT rule to be moved.

after: Moves the rule nat-rule-name1 to the line after the rule nat-rule-name2 (called the reference rule). The priority value of the reference rule is not changed. The priority value of the moved rule equals the priority value of the reference rule plus one.

before: Moves the rule nat-rule-name1 to the line before the rule nat-rule-name2. The priority value of the reference rule is not changed. The priority value of the moved rule equals the priority value of the reference rule minus one.

nat-rule-name2: Specifies the name of the NAT rule as a reference rule for the NAT rule to be moved.

Usage guidelines

This command is applicable only to named ACL-based NAT server rules.

A NAT rule appearing earlier on the rule list has a higher priority for packet matching.

Examples

# Move the ACL-based NAT server rule abc to the line before the ACL-based NAT server rule def.

<Sysname> system-view

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] nat server rule move abc before def

Related commands

nat server

nat server-group

Use nat server-group to create an internal server group and enter its view, or enter the view of an existing internal server group.

Use undo nat server-group to delete an internal server group.

Syntax

nat server-group group-id

undo nat server-group group-id

Default

No internal server groups exist.

Views

System view

Predefined user roles

network-admin

Parameters

group-id: Assigns an ID to the internal server group.The value range for this argument is 0 to 65535.

Usage guidelines

An internal server group can contain multiple members configured by the inside ip command.

Examples

# Create internal server group 1.

<Sysname> system-view

[Sysname] nat server-group 1

Related commands

display nat all

display nat server-group

inside ip

nat server

nat static enable

Use nat static enable to enable static NAT on an interface.

Use undo nat static enable to disable static NAT on an interface.

Syntax

nat static enable

undo nat static enable

Default

Static NAT is disabled.

Views

Interface view

Predefined user roles

network-admin

Usage guidelines

Static NAT mappings take effect on an interface only after static NAT is enabled on the interface.

Examples

# Configure an outbound static NAT mapping between private IP address 192.168.1.1 and public IP address 2.2.2.2, and enable static NAT on VLAN-interface 10.

<Sysname> system-view

[Sysname] nat static outbound 192.168.1.1 2.2.2.2

[Sysname] interface vlan-interface 10

[Sysname-Vlan-interface10] nat static enable

Related commands

display nat all

display nat static

nat static

nat static net-to-net

nat static inbound

Use nat static inbound to configure a one-to-one mapping for inbound static NAT.

Use undo nat static inbound to delete a one-to-one mapping for inbound static NAT.

Syntax

nat static inbound global-ip local-ip [ acl { ipv4-acl-number | name ipv4-acl-name } [ reversible ] ] [ rule rule-name ] [ priority priority ] [ disable ] [ counting ]

undo nat static inbound global-ip local-ip

Default

No NAT mappings exist.

Views

System view

Predefined user roles

network-admin

Parameters

global-ip: Specifies a public IP address.

local-ip: Specifies a private IP address.

acl: Specifies an ACL to identify the internal hosts that can access the external network.

ipv4-acl-number: Specifies an ACL by its number in the range of 2000 to 3999.

name ipv4-acl-name: Specifies an ACL by its name, a case-insensitive string of 1 to 63 characters. The ACL name must start with an English letter and to avoid confusion, it cannot be all.

reversible: Enables reverse address translation for connections actively initiated from the internal network to the private IP address.

rule rule-name: Specifies a name for the mapping, a case-sensitive string of 1 to 63 characters. It cannot contain backward slashes (\), forward slashes (/), colons (:), asterisks (*), question marks (?), left angle brackets (<), right angle brackets (>), vertical bars (|), quotation marks ("), or at signs (@). If you do not specify this option, the mapping does not have a name.

priority priority: Specifies a priority for the mapping, in the range of 0 to 2147483647. A smaller value represents a higher priority. If you do not specify this option, the mapping has the lowest priority among the same type of NAT rules.

disable: Disables the one-to-one inbound static mapping. If you do not specify this keyword, the mapping is enabled.

counting: Enables NAT counting. The number of flows that use the address mapping is counted.

Usage guidelines

When the source IP address of a packet from the external network to the internal network matches the global-ip, the source IP address is translated into the local-ip. When the destination IP address of a packet from the internal network to the external network matches the local-ip, the destination IP address is translated into the global-ip.

When you specify an ACL, follow these restrictions and guidelines:

·     If you do not specify an ACL, the source address of all incoming packets and the destination address of all outgoing packets are translated.

·     If you specify an ACL and do not specify the reversible keyword, the source address of incoming packets permitted by the ACL is translated. The destination address is not translated for connections actively initiated from the internal network to the private IP address.

·     If you specify both an ACL and the reversible keyword, the source address of incoming packets permitted by the ACL is translated. If packets of connections actively initiated from the internal network to the private IP address are permitted by ACL reverse matching, the destination address is translated. ACL reverse matching works as follows:

¡     Compares the source IP address/port of a packet with the destination IP addresses/ports in the ACL.

¡     Translates the destination IP address of the packet according to the mapping, and then compares the translated destination IP address/port with the source IP addresses/ports in the ACL.

Static NAT takes precedence over dynamic NAT when both are configured on an interface.

You can configure multiple inbound static NAT mappings by using the nat static inbound command and the nat static inbound net-to-net command.

One-to-one mappings for inbound static NAT that are configured with the same priority value and an ACL are matched by using the ACLs in the mappings.

·     Mappings with named ACLs have higher priorities than mappings with unnamed ACLs.

·     Mappings with named ACLs are matched in alphabetical order of their ACL names.

·     Mappings with unnamed ACLs are matched in descending order of their ACL numbers.

Examples

# Configure an inbound static NAT mapping between public IP address 2.2.2.2 and private IP address 192.168.1.1.

<Sysname> system-view

[Sysname] nat static inbound 2.2.2.2 192.168.1.1

Related commands

display nat all

display nat static

nat static enable

nat static inbound net-to-net

Use nat static inbound net-to-net to configure a net-to-net mapping for inbound static NAT.

Use undo nat static inbound net-to-net to remove a net-to-net mapping for inbound static NAT.

Syntax

nat static inbound net-to-net global-start-address global-end-address local local-network { mask-length | mask } [ acl { ipv4-acl-number | name ipv4-acl-name } [ reversible ] ] [ rule rule-name ] [ priority priority ] [ disable ] [ counting ]

undo nat static inbound net-to-net global-start-address global-end-address local local-network { mask-length | mask }

Default

No NAT mappings exist.

Views

System view

Predefined user roles

network-admin

Parameters

global-start-address global-end-address: Specifies a public address range which can contain a maximum of 255 addresses. The global-end-address must not be lower than global-start-address. If they are the same, only one public address is specified.

local-network: Specifies a private network address.

mask-length: Specifies the mask length of the private network address, in the range of 8 to 31.

mask: Specifies the mask of the private network address.

acl: Specifies an ACL to identify the internal hosts that can access the external network.

ipv4-acl-number: Specifies an ACL by its number in the range of 2000 to 3999.

name ipv4-acl-name: Specifies an ACL by its name, a case-insensitive string of 1 to 63 characters. The ACL name must start with an English letter and to avoid confusion, it cannot be all.

reversible: Enables reverse address translation for connections actively initiated from the internal network to the private IP addresses.

rule rule-name: Specifies a name for the mapping, a case-sensitive string of 1 to 63 characters. It cannot contain backward slashes (\), forward slashes (/), colons (:), asterisks (*), question marks (?), left angle brackets (<), right angle brackets (>), vertical bars (|), quotation marks ("), or at signs (@). If you do not specify this option, the mapping does not have a name.

priority priority: Specifies a priority for the mapping, in the range of 0 to 2147483647. A smaller value represents a higher priority. If you do not specify this option, the mapping has the lowest priority among the same type of NAT rules.

disable: Disables the net-to-net inbound static mapping. If you do not specify this keyword, the mapping is enabled.

counting: Enables NAT counting. The number of flows that use the address mapping is counted.

Usage guidelines

Specify a public network through a start address and an end address, and a private network through a private address and a mask.

When the source address of a packet from the external network matches the public address range, the source address is translated into a private address in the private address range. When the destination address of a packet from the internal network matches the private address range, the destination address is translated into a public address in the public address range.

The public end address cannot be greater than the greatest IP address in the subnet determined by the public start address and the private network mask. For example, if the private address is 2.2.2.0 with a mask 255.255.255.0 and the public start address is 1.1.1.100, the public end address cannot be greater than 1.1.1.255, the greatest IP address in the subnet 1.1.1.0/24.

When you specify an ACL, follow these restrictions and guidelines:

·     If you do not specify an ACL, the source address of all incoming packets and the destination address of all outgoing packets are translated.

·     If you specify an ACL and do not specify the reversible keyword, the source address of incoming packets permitted by the ACL is translated. The destination address is not translated for connections actively initiated from the internal network to the private IP addresses.

·     If you specify both an ACL and the reversible keyword, the source address of incoming packets permitted by the ACL is translated. If packets of connections actively initiated from the internal network to the private IP addresses are permitted by ACL reverse matching, the destination address is translated. ACL reverse matching works as follows:

¡     Compares the source IP address/port of a packet with the destination IP addresses/ports in the ACL.

¡     Translates the destination IP address of the packet according to the mapping, and then compares the translated destination IP address/port with the source IP addresses/ports in the ACL.

Static NAT takes precedence over dynamic NAT when both are configured on an interface.

You can configure multiple inbound static NAT mappings by using the nat static inbound command and the nat static inbound net-to-net command.

Net-to-net mappings for inbound static NAT that are configured with the same priority value and an ACL are matched by using the ACLs in the mappings.

·     Mappings with named ACLs have higher priorities than mappings with unnamed ACLs.

·     Mappings with named ACLs are matched in alphabetical order of their ACL names.

·     Mappings with unnamed ACLs are matched in descending order of their ACL numbers.

Examples

# Configure an inbound static NAT between public network address 202.100.1.0/24 and private network address 192.168.1.0/24.

<Sysname> system-view

[Sysname] nat static inbound net-to-net 202.100.1.1 202.100.1.255 local 192.168.1.0 24

Related commands

display nat all

display nat static

nat static enable

nat static inbound rule move

Use nat static inbound rule move to change the priority of an inbound one-to-one static NAT rule.

Syntax

nat static inbound rule move nat-rule-name1 { after | before } nat-rule-name2

Views

System view

Predefined user roles

network-admin

Parameters

nat-rule-name1: Specifies the name of the NAT rule to be moved.

after: Moves the rule nat-rule-name1 to the line after the rule nat-rule-name2 (called the reference rule). The priority value of the reference rule is not changed. The priority value of the moved rule equals the priority value of the reference rule plus one.

before: Moves the rule nat-rule-name1 to the line before the rule nat-rule-name2. The priority value of the reference rule is not changed. The priority value of the moved rule equals the priority value of the reference rule minus one.

nat-rule-name2: Specifies the name of the NAT rule as a reference rule for the NAT rule to be moved.

Usage guidelines

This command is applicable only to named inbound one-to-one static NAT rules.

A NAT rule appearing earlier on the rule list has a higher priority for packet matching.

Examples

# Move the inbound one-to-one static NAT rule abc to the line before the inbound one-to-one static NAT rule def.

<Sysname> system-view

[Sysname] nat static inbound rule move abc before def

Related commands

nat static inbound

nat static outbound

Use nat static outbound to configure a one-to-one mapping for outbound static NAT.

Use undo nat static outbound to remove a one-to-one mapping for outbound static NAT.

Syntax

nat static outbound local-ip global-ip [ acl { ipv4-acl-number | name ipv4-acl-name } [ reversible ] ] [ rule rule-name ] [ priority priority ] [ disable ] [ counting ]

undo nat static outbound local-ip global-ip

Default

No NAT mappings exist.

Views

System view

Predefined user roles

network-admin

Parameters

local-ip: Specifies a private IP address.

global-ip: Specifies a public IP address.

acl: Specifies an ACL to define the destination IP addresses that internal hosts can access.

ipv4-acl-number: Specifies an ACL by its number in the range of 3000 to 3999.

name ipv4-acl-name: Specifies an ACL by its name, a case-insensitive string of 1 to 63 characters. The ACL name must start with an English letter and to avoid confusion, it cannot be all.

reversible: Enables reverse address translation for connections actively initiated from the external network to the public IP address.

rule rule-name: Specifies a name for the mapping, a case-sensitive string of 1 to 63 characters. It cannot contain backward slashes (\), forward slashes (/), colons (:), asterisks (*), question marks (?), left angle brackets (<), right angle brackets (>), vertical bars (|), quotation marks ("), or at signs (@). If you do not specify this option, the mapping does not have a name.

priority priority: Specifies a priority for the mapping, in the range of 0 to 2147483647. A smaller value represents a higher priority. If you do not specify this option, the mapping has the lowest priority among the same type of NAT rules.

disable: Disables the one-to-one outbound static mapping. If you do not specify this keyword, the mapping is enabled.

counting: Enables NAT counting. The number of flows that use the address mapping is counted.

Usage guidelines

When the source IP address of an outgoing packet matches the local-ip, the IP address is translated into the global-ip. When the destination IP address of an incoming packet matches the global-ip, the destination IP address is translated into the local-ip.

When you specify an ACL, follow these restrictions and guidelines:

·     If you do not specify an ACL, the source address of all outgoing packets and the destination address of all incoming packets are translated.

·     If you specify an ACL and do not specify the reversible keyword, the source address of outgoing packets permitted by the ACL is translated. The destination address is not translated for connections actively initiated from the external network to the public IP address.

·     If you specify both an ACL and the reversible keyword, the source address of outgoing packets permitted by the ACL is translated. If packets of connections actively initiated from the external network to the public IP address are permitted by ACL reverse matching, the destination address is translated. ACL reverse matching works as follows:

¡     Compares the source IP address/port of a packet with the destination IP addresses/ports in the ACL.

¡     Translates the destination IP address of the packet according to the mapping, and then compares the translated destination IP address/port with the source IP addresses/ports in the ACL.

Static NAT takes precedence over dynamic NAT when they are both configured on an interface.

You can configure multiple outbound static NAT mappings by using the nat static outbound command and the nat static outbound net-to-net command.

One-to-one mappings for outbound static NAT that are configured with the same priority value and an ACL are matched by using the ACLs in the mappings.

·     Mappings with named ACLs have higher priorities than mappings with unnamed ACLs.

·     Mappings with named ACLs are matched in alphabetical order of their ACL names.

·     Mappings with unnamed ACLs are matched in descending order of their ACL numbers.

Examples

# Configure an outbound static NAT mapping between public IP address 2.2.2.2 and private IP address 192.168.1.1.

<Sysname> system-view

[Sysname] nat static outbound 192.168.1.1 2.2.2.2

# Configure outbound static NAT, and allow the internal user 192.168.1.1 to access the external network 3.3.3.0/24 by using the public IP address 2.2.2.2.

<Sysname> system-view

[Sysname] acl advanced 3001

[Sysname-acl-ipv4-adv-3001] rule permit ip destination 3.3.3.0 0.0.0.255

[Sysname-acl-ipv4-adv-3001] quit

[Sysname] nat static outbound 192.168.1.1 2.2.2.2 acl 3001

Related commands

display nat all

display nat static

nat static enable

nat static outbound net-to-net

Use nat static outbound net-to-net to configure a net-to-net outbound static NAT mapping.

Use undo nat static outbound net-to-net to remove the specified net-to-net outbound static NAT mapping.

Syntax

nat static outbound net-to-net local-start-address local-end-address global global-network { mask-length | mask } [ acl { ipv4-acl-number | name ipv4-acl-name } [ reversible ] ] [ rule rule-name ] [ priority priority ] [ disable ] [ counting ]

undo nat static outbound net-to-net local-start-address local-end-address global global-network { mask-length | mask }

Default

No NAT mappings exist.

Views

System view

Predefined user roles

network-admin

Parameters

local-start-address local-end-address: Specifies a private address range which can contain a maximum of 255 addresses. The local-end-address must not be lower than local-start-address. If they are the same, only one private address is specified.

global-network: Specifies a public network address.

mask-length: Specifies the mask length of the public network address, in the range of 8 to 31.

mask: Specifies the mask of the public network address.

acl: Specifies an ACL to define the destination IP addresses that internal hosts can access.

ipv4-acl-number: Specifies an ACL number in the range of 2000 to 3999.

name ipv4-acl-name: Specifies an ACL by its name, a case-insensitive string of 1 to 63 characters. The ACL name must start with an English letter and to avoid confusion, it cannot be all.

reversible: Enables reverse address translation for connections actively initiated from the external network to the public IP addresses.

rule rule-name: Specifies a name for the mapping, a case-sensitive string of 1 to 63 characters. It cannot contain backward slashes (\), forward slashes (/), colons (:), asterisks (*), question marks (?), left angle brackets (<), right angle brackets (>), vertical bars (|), quotation marks ("), or at signs (@). If you do not specify this option, the mapping does not have a name.

priority priority: Specifies a priority for the mapping, in the range of 0 to 2147483647. A smaller value represents a higher priority. If you do not specify this option, the mapping has the lowest priority among the same type of NAT rules.

disable: Disables the net-to-net outbound static mapping. If you do not specify this keyword, the mapping is enabled.

counting: Enables NAT counting. The number of flows that use the address mapping is counted.

Usage guidelines

Specify a private network through a start address and an end address, and a public network through a public address and a mask.

When the source address of a packet from the internal network matches the private address range, the source address is translated into a public address in the public address range. When the destination address of a packet from the external network matches the public address range, the destination address is translated into a private address in the private address range.

The private end address cannot be greater than the greatest IP address in the subnet determined by the private start address and the public network mask. For example, the public address is 2.2.2.0 with a mask 255.255.255.0, and the private start address is 1.1.1.100. The private end address cannot be greater than 1.1.1.255, the greatest IP address in the subnet 1.1.1.0/24.

When you specify an ACL, follow these restrictions and guidelines:

·     If you do not specify an ACL, the source address of all outgoing packets and the destination address of all incoming packets are translated.

·     If you specify an ACL and do not specify the reversible keyword, the source address of outgoing packets permitted by the ACL is translated. The destination address is not translated for connections actively initiated from the external network to the public IP addresses.

·     If you specify both an ACL and the reversible keyword, the source address of outgoing packets permitted by the ACL is translated. If packets of connections actively initiated from the external network to the public IP addresses are permitted by ACL reverse matching, the destination address is translated. ACL reverse matching works as follows:

¡     Compares the source IP address/port of a packet with the destination IP addresses/ports in the ACL.

¡     Translates the destination IP address of the packet according to the mapping, and then compares the translated destination IP address/port with the source IP addresses/ports in the ACL.

Static NAT takes precedence over dynamic NAT when they are both configured on an interface.

You can configure multiple outbound static NAT mappings by using the nat static outbound command and the nat static outbound net-to-net command.

Net-to-net mappings for outbound static NAT that are configured with the same priority value and an ACL are matched by using the ACLs in the mappings.

·     Mappings with named ACLs have higher priorities than mappings with unnamed ACLs.

·     Mappings with named ACLs are matched in alphabetical order of their ACL names.

·     Mappings with unnamed ACLs are matched in descending order of their ACL numbers.

Examples

# Configure an outbound static NAT mapping between private network address 192.168.1.0/24 and public network address 2.2.2.0/24.

<Sysname> system-view

[Sysname] nat static outbound net-to-net 192.168.1.1 192.168.1.255 global 2.2.2.0 24

# Configure outbound static NAT. Allow internal users on subnet 192.168.1.0/24 to access the external subnet 3.3.3.0/24 by using public IP addresses on subnet 2.2.2.0/24.

<Sysname> system-view

[Sysname] acl advanced 3001

[Sysname-acl-ipv4-adv-3001] rule permit ip destination 3.3.3.0 0.0.0.255

[Sysname-acl-ipv4-adv-3001] quit

[Sysname] nat static outbound net-to-net 192.168.1.1 192.168.1.255 global 2.2.2.0 24 acl 3001

Related commands

display nat all

display nat static

nat static enable

nat static outbound rule move

Use nat static outbound rule move to change the priority of an outbound one-to-one static NAT rule.

Syntax

nat static outbound rule move nat-rule-name1 { after | before } nat-rule-name2

Views

System view

Predefined user roles

network-admin

Parameters

nat-rule-name1: Specifies the name of the NAT rule to be moved.

after: Moves the rule nat-rule-name1 to the line after the rule nat-rule-name2 (called the reference rule). The priority value of the reference rule is not changed. The priority value of the moved rule equals the priority value of the reference rule plus one.

before: Moves the rule nat-rule-name1 to the line before the rule nat-rule-name2. The priority value of the reference rule is not changed. The priority value of the moved rule equals the priority value of the reference rule minus one.

nat-rule-name2: Specifies the name of the NAT rule as a reference rule for the NAT rule to be moved.

Usage guidelines

This command is applicable only to named outbound one-to-one static NAT rules..

A NAT rule appearing earlier on the rule list has a higher priority for packet matching.

Examples

# Move the outbound one-to-one static NAT rule abc to the line before the outbound one-to-one static NAT rule def.

<Sysname> system-view

[Sysname] nat static outbound rule move abc before def

Related commands

nat static outbound

nat timestamp delete

Use nat timestamp delete to enable the deletion of timestamps in TCP SYN and SYN ACK packets.

Use undo nat timestamp delete to restore the default.

Syntax

nat timestamp delete

undo nat timestamp delete

Default

The TCP SYN and SYN ACK packets carry the timestamp.

Views

System view

Predefined user roles

network-admin

Usage guidelines

If PAT mode is configured on an interface by using nat inbound or nat outbound, and the tcp_timestamp and tcp_tw_recycle function is configured on the TCP server, TCP connections might not be established. To solve the problem, you can shut down the tcp_tw_recycle function or configure the nat timestamp delete command.

Examples

# Enable the deletion of the timestamp for TCP SYN and SYN ACK packets on the public network.

<Sysname> system-view

[Sysname] nat timestamp delete

Related commands

nat outbound

nat inbound

port-block

Use port block to configure port block parameters for a NAT address group.

Use undo port block to restore the default.

Syntax

port block block-size block-size [ extended-block-number extended-block-number ]

undo port block

Default

No port block parameters are configured for a NAT address group.

Views

NAT address group view

Predefined user roles

network-admin

Parameters

block-size block-size: Specifies the port block size. The value range for the block-size argument is 1 to 65535. In a NAT address group, the port block size cannot be larger than the number of ports in the port range.

extended-block-number extended-block-number: Specifies the number of extended port blocks, in the range of 1 to 5. When a private IP address accesses the public network, but the ports in the selected port block are all occupied, the NAT444 gateway extends port blocks one by one for the private IP address.

Usage guidelines

To configure dynamic port block mappings, port block parameters are required in the NAT address group. When a private IP address initiates a connection to the public network, the NAT444 gateway assigns it a public IP address and a port block, and creates an entry for the mapping. For subsequent connections from the private IP address, the NAT444 gateway translates the private IP address to the mapped public IP address and the ports to ports in the selected port block.

Examples

# Set the port block size to 256 and the number of extended port blocks to 1 in NAT address group 2.

<Sysname> system-view

[Sysname] nat address-group 2

[Sysname-address-group-2] port-block block-size 256 extended-block-number 1

Related commands

nat address-group

port-range

Use port-range to specify a port range for public IP addresses.

Use undo port-range to restore the default.

Syntax

port-range start-port-number end-port-number

undo port-range

Default

The port range for public IP addresses is 1 to 65535.

Views

NAT address group view

NAT port block group view

Predefined user roles

network-admin

Parameters

start-port-number end-port-number: Specifies the start port number and end port number for the port range. The end port number cannot be smaller than the start port number. As a best practice, set the start port number to be equal to or larger than 1024 to avoid an application protocol identification error.

Usage guidelines

The port range must include all ports that public IP addresses use for address translation.

The number of ports in a port range cannot be smaller than the port block size.

Examples

# Specify the port range as 1024 to 65535 for NAT address group 1.

<Sysname> system-view

[Sysname] nat address-group 1

[Sysname-address-group-1] port-range 1024 65535

# Specify the port range as 30001 to 65535 for NAT port block group 1.

<Sysname> system-view

[Sysname] nat port-block-group 1

[Sysname-port-block-group-1] port-range 30001 65535

Related commands

nat address-group

nat port-block-group

reset nat count statistics

Use reset nat count statistics to clear NAT counting statistics.

Syntax

reset nat count statistics { all | dynamic | server | static | static-port-block }

Views

User view

Predefined user roles

network-admin

Parameters

all: Clears all counting statistics for NAT mappings.

dynamic: Clears counting statistics for dynamic NAT mappings.

server: Clears counting statistics for NAT server mappings.

static: Clears counting statistics for static NAT mappings.

static-port-block: Clears counting statistics for NAT444 mappings.

Examples

# Clear all counting statistics for static NAT mappings.

<Sysname> reset nat count statistics all

Related commands

display nat inbound

display nat outbound

display nat outbound port-block-group

display nat port-block

display nat static

display nat server

reset nat session

Use reset nat session to clear NAT sessions.

Syntax

In standalone mode:

reset nat session

In IRF mode:

reset nat session [ slot slot-number ]

Views

User view

Predefined user roles

network-admin

Parameters

slot slot-number: Specifies an IRF member device by its member ID. If you do not specify a member device, this command clears NAT sessions for all member devices. (In IRF mode.)

Usage guidelines

After you clear the NAT sessions, the corresponding NAT EIM table and NO-PAT table are cleared at the same time.

Examples

# (In standalone mode.) Clear all NAT sessions.

<Sysname> reset nat session

# (In IRF mode.) Clear NAT sessions for the specified slot.

<Sysname> reset nat session slot 1

Related commands

display nat session