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. Each address range can contain a maximum of 256 addresses.

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.

You can add multiple address ranges to a NAT address group by repeating this command. Make sure the address ranges do not overlap in the NAT address group.

All NAT address groups can contain a maximum of 4096 address ranges in total.

If a public address range overlaps with the address range in static port block mappings, make sure the port ranges in static port block mappings do not overlap with those in dynamic port block mappings. Otherwise, the device might assign the same IP address and port block to two different users, in which condition NAT sessions might not be established for one user.

Examples

# Add two 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

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 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

--- ---

# Display information about NAT address group 1.

<Sysname> display nat address-group 1

Address group 1:

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
Totally n NAT address groups	Total number of NAT address groups.
Address group	ID of the NAT address group.
Port range	Port range for public IP addresses.
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.
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 (---).

Related commands

nat address-group

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

# 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: GigabitEthernet0/0/1

ACL: 2038 Address group: 2 Add route: Y

NO-PAT: Y Reversible: N

VPN instance: vpn_nat

Rule name: ruleinbound

Priority: 1000

Config status: Active

NAT outbound information:

Totally 2 NAT outbound rules.

Interface: GigabitEthernet1/0/2

ACL: 2036 Address group: 1 Port-preserved: Y

NO-PAT: N Reversible: N

Rule name: ruleoutbound1

Priority: 1001

Config status: Inactive

Reasons for inactive status:

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

Interface: GigabitEthernet1/0/2

ACL: 2037 Address group: 1 Port-preserved: N

NO-PAT: Y Reversible: Y

Rule name: ruleoutbound2

Priority: 1002

VPN instance: vpn_nat

Config status: Active

NAT internal server information:

Totally 5 internal servers.

Interface: GigabitEthernet0/0/1

Global ACL : 2000

Local IP/port : 192.168.10.1/23

Rule name : rule1

Priority : 1000

Config status : Active

Interface: GigabitEthernet0/0/3

Protocol: 6(TCP)

Global IP/port: 50.1.1.1/23

Local IP/port : 192.168.10.15/23

ACL : 2000

Rule name : rule2

Config status : Active

Interface: GigabitEthernet0/0/4

Protocol: 6(TCP)

Global IP/port: 50.1.1.1/23-30

Local IP/port : 192.168.10.15-192.168.10.22/23

Global VPN : vpn1

Local VPN : vpn3

Rule name : rule3

Config status : Active

Interface: GigabitEthernet0/0/4

Protocol: 255(Reserved)

Global IP/port: 50.1.1.100/---

Local IP/port : 192.168.10.150/---

Global VPN : vpn2

Local VPN : vpn4

ACL : 3000

Rule name : rule4

Config status : Inactive

Reasons for inactive status:

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

Interface: GigabitEthernet0/0/5

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)

Global VPN : vpn1

Local VPN : vpn3

Rule name : rule5

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

Global VPN : vpn2

Local VPN : vpn1

ACL : 2000

Reversible : Y

Rule name : rulestatic1

Priority : 1000

Config status: Active

IP-to-IP:

Global IP : 5.5.5.5

Local IP : 4.4.4.4

Global VPN : vpn3

Local VPN : vpn4

ACL : 2001

Reversible : Y

Rule name : rulestatic2

Priority : 1000

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

Local VPN : vpn1

Global VPN : vpn2

ACL : 2000

Reversible : Y

Rule name : rulenettonet1

Priority : 1000

Config status: Active

IP-to-IP:

Local IP : 4.4.4.4

Global IP : 5.5.5.5

Local VPN : vpn1

Global VPN : vpn2

ACL: : 2001

Reversible : Y

Rule name : rulenettonet2

Priority : 1000

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: GigabitEthernet0/0/4

Config status: Active

Interface: GigabitEthernet0/0/6

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

Flow-begin : Disabled

Flow-end : Disabled

Flow-active : Disabled

Port-block-assign : Disabled

Port-block-withdraw : Disabled

Port-alloc-fail : Enabled

Port-block-alloc-fail : Disabled

Port-usage : Disabled

Port-block-usage : Enabled(40%)

NAT hairpinning:

Totally 2 interfaces enabled with NAT hairpinning.

Interface: GigabitEthernet0/0/4

Config status: Active

Interface: GigabitEthernet0/0/6

Config status: Active

NAT mapping behavior:

Mapping mode : Endpoint-Independent

ACL : 2050

Config status: Active

NAT ALG:

DNS : Enabled

FTP : Enabled

H323 : Disabled

ICMP-ERROR : Enabled

ILS : Disabled

MGCP : Disabled

NBT : Disabled

PPTP : Enabled

RTSP : Enabled

RSH : Disabled

SCCP : Disabled

SIP : Disabled

SQLNET : Disabled

TFTP : Disabled

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 vpna

192.168.3.1 192.168.3.254 vpna

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 vpnb

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: GigabitEthernet1/0/2

port-block-group: 2

Rule name: ruleoutbound1

Config status : Active

Interface: GigabitEthernet1/0/2

Rule name: ruleoutbound2

port-block-group: 10

Config status : Inactive

Reasons for inactive status:

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

The output shows all NAT configuration information. Table 2 describes only the fields for the output of the nat hairpin enable and nat mapping-behavior 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 16 for output description.
NAT inbound information:	Inbound dynamic NAT configuration. See Table 6 for output description.
NAT outbound information	Outbound dynamic NAT configuration. See Table 10 for output description.
NAT internal server information	NAT server mapping configuration. See Table 15 for output description.
Static NAT mappings	Static NAT mappings. See Table 18 for output description.
NAT DNS mappings	NAT DNS mappings. See Table 3 for output description.
NAT logging	NAT logging configuration. See Table 8 for output description.
NAT hairpinning	NAT hairpin configuration.
Totally n interfaces enabled NAT hairpinning	Number of interfaces with NAT hairpin enabled.
Interface	NAT hairpin-enabled interface.
Rule name	Name of the NAT rule.
Priority	Priority of the NAT rule.
Config status	Status of the NAT hairpin configuration.
NAT mapping behavior	Mapping behavior mode of PAT: · Endpoint-Independent. · Address and Port-Dependent Mapping.
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 14 for output description.
NAT outbound port block group information	Configuration information about static outbound port block mapping. See Table 11 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

display nat eim [ slot slot-number ] [ protocol { tcp | udp } ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

slot slot-number: Specifies a card by its slot number. If you do not specify a card, this command displays EIM entry information for all cards.

protocol: Specifies a protocol by its type.

tcp: Specifies the TCP protocol.

udp: Specifies the UDP protocol.

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

# Display information about NAT EIM entries for CPU 0 on the specified slot.

<Sysname> display nat eim slot 1 cpu 0

CPU 0 on slot 1:

Local IP/port: 192.168.100.100/1024

Global IP/port: 200.100.1.100/2048

DS-Lite tunnel peer: -

Local VPN: vpn1

Global VPN: vpn2

Protocol: TCP(6)

Local IP/port: 192.168.100.200/2048

Global IP/port: 200.100.1.200/4096

DS-Lite tunnel peer: -

Protocol: UDP(17)

Total entries found: 2

# Display information about NAT EIM entries for TCP for CPU 0 on the specified slot.

<Sysname> display nat eim slot 1 cpu 0 protocol tcp

CPU 0 on slot 1:

Local IP/port: 192.168.100.100/1024

Global IP/port: 200.100.1.100/2048

DS-Lite tunnel peer: -

Local VPN: vpn1

Global VPN: vpn2

Protocol: TCP(6)

Total entries found: 1

Table 4 Command output

Field	Description
CPU	Number of the CPU.
DS-Lite tunnel peer	DS-Lite tunnel B4 address. If the session does not belong to any DS-Lite tunnel, this field displays a hyphen (-).
Local VPN	MPLS L3VPN instance to which the private IP address belongs. If the private IP address does not belong to any VPN instance, this field is not displayed.
Global VPN	MPLS L3VPN instance to which the public IP address belongs. If the public IP address does not belong to any VPN instance, this field is not displayed.
Protocol	Protocol name and number.
Total entries found	Total number of EIM entries.

Related commands

nat mapping-behavior

nat outbound

display nat eim statistics

Use display nat eim statistics to display NAT EIM entry statistics.

Syntax

display nat eim statistics [ slot slot-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

slot slot-number: Specifies a card by its slot number. If you do not specify a card, this command displays EIM entry statistics for all cards.

Usage guidelines

The NAT EIM entry statistics includes the following information:

· The number of EIM entries.

· The creation rate of EIM entries for TCP.

· The creation rate of EIM entries for UDP.

Examples

# Display EIM entry statistics for the specified slot.

<Sysname> display nat eim statistics slot 2

EIM: Total EIM entries.

TCP: Total EIM entries for TCP.

UDP: Total EIM entries for UDP.

Rate: Creating rate of EIM entries.

TCP rate: Creating rate of EIM entries for TCP.

UDP rate: Creating rate of EIM entries for UDP.

Slot EIM TCP UDP Rate TCP rate UDP rate

(entries/s) (entries/s) (entries/s)

2 0 0 0 0 0 0

Table 5 Command output

Field	Description
Total EIM entries	Total number of EIM entries.
Total EIM entries for TCP	Total number of EIM entries for TCP.
Total EIM entries for UDP	Total number of EIM entries for UDP.
Creating rate of EIM entries	Creation rate of EIM entries.
Creating rate of EIM entries for TCP	Creation rate of EIM entries for TCP.
Creating rate of EIM entries for UDP	Creation rate of EIM entries for UDP.

Related commands

nat mapping-behavior

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

# Display inbound dynamic NAT configuration.

<Sysname> display nat inbound

NAT inbound information:

Totally 2 NAT inbound rules.

Interface: GigabitEthernet1/0/2

ACL: 2038 Address group: 2 Add route: Y

NO-PAT: Y Reversible: N

VPN instance: vpn1

Rule name: ruleinbound1

Priority: 1000

Config status: Active

Interface: GigabitEthernet0/0/3

ACL: 2037 Address group: 1 Add route: Y

NO-PAT: Y Reversible: N

VPN instance: vpn2

Rule name: ruleinbound2

Priority: 1000

Config status: Inactive

Reasons for inactive status:

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

Table 6 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	NAT address group used by the inbound dynamic NAT rule.
Add route	Whether to add a route when a packet matches the inbound dynamic NAT rule: · Y—Adds a route. · N—Does not add a route.
NO-PAT	Whether NO-PAT or PAT is used: · Y—NO-PAT is used. · N—PAT is used.
Reversible	Whether reverse address translation is allowed: · Y—Reverse address translation is allowed. · N—Reverse address translation is not allowed.
VPN instance	MPLS L3VPN instance to which the NAT address group belongs. If the NAT address group does not belong to any VPN instance, the field is not displayed.
Rule name	Name of the NAT rule.
Priority	Priority of the NAT rule.
Config status	Status of the inbound dynamic NAT configuration: Active or Inactive.
Reasons for inactive status	Reasons why the inbound dynamic NAT configuration does not take effect. This field is available when the Config status is Inactive.

Related commands

nat inbound

display nat instance

Use display nat instance to display NAT instance configuration information.

Syntax

display nat instance [ name instance-name ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

name instance-name: Specifies a NAT instance by its name, a case-sensitive string of 1 to 31 characters. If you do not specify this option, the command displays configuration information about all NAT instances.

Examples

# Display configuration information about all NAT instances.

<Sysname> display nat instance

NAT Instance information:

Totally 1 NAT instance.

Instance instance1:

Instance ID: 10

nat server protocol tcp global 1.1.1.1 inside 2.2.2.2

# Display configuration information about NAT instance instance1.

<Sysname> display nat instance instance1

Instance instance1:

Instance ID: 10

nat server protocol tcp global 1.1.1.1 inside 2.2.2.2

Table 7 Command output

Field	Description
Totally n NAT instances	Total number of NAT instances.
Instance xxx	Name of the NAT instance.
Instance ID	NAT instance ID.
nat server protocol tcp global 1.1.1.1 inside 2.2.2.2	NAT server mapping configuration.

Related commands

nat instance

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

Flow-begin : Disabled

Flow-end : Disabled

Flow-active : Disabled

Port-block-assign : Disabled

Port-block-withdraw : Disabled

Port-alloc-fail : Enabled

Port-block-alloc-fail : Disabled

Port-usage : Disabled

Port-block-usage : Enabled(40%)

Table 8 Command output

Field	Description
NAT logging	NAT logging configuration.
Log enable	Enabling status of NAT logging. · Enabled—NAT logging is enabled. If an ACL is specified for NAT logging, this field also displays the ACL number or name. · Disabled—NAT logging is disabled.
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 logging for NAT port block assignment.
Port-block-withdraw	Enabling status of logging for NAT port block withdrawal.
Port-alloc-fail	Enabling status of logging for NAT port allocation failures.
Port-block-alloc-fail	Enabling status of logging for NAT port block assignment failures.
Port-usage	Enabling status of logging for port usage in port blocks. If logging for port usage in port blocks is enabled, this field also displays the usage threshold in percentage.
Port-block-usage	Logging is enabled for port block usage. This field also displays the port block usage threshold in percentage. The default threshold value is 90%.

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

display nat no-pat [ slot slot-number ]

Views

Any view

Default user roles

network-admin

network-operator

Parameters

slot slot-number: Specifies a card by its slot number. If you do not specify a card, this command displays NO-PAT entry information for all cards.

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

# 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

Global VPN: vpn2

Local VPN: vpn1

Reversible: N

Type : Inbound

Local IP: 192.168.100.200

Global IP: 200.100.1.200

Reversible: Y

Type : Outbound

Total entries found: 2

# Display information about NO-PAT entries for CPU 0 on the specified slot.

<Sysname> display nat no-pat slot 1 cpu 0

CPU 0 on slot 1:

Global IP: 200.100.1.100

Local IP: 192.168.100.100

Global VPN: vpn2

Local VPN: vpn1

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 9 Command output

Field	Description
CPU	Number of the CPU.
Local VPN	MPLS L3VPN instance to which the private IP address belongs. If the private IP address does not belong to any VPN instance, this field is not displayed.
Global VPN	MPLS L3VPN instance to which the public IP address belongs. If the public IP address does not belong to any VPN instance, this field is not displayed.
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

# Display outbound dynamic NAT configuration.

<Sysname> display nat outbound

NAT outbound information:

Totally 2 NAT outbound rules.

Interface: GigabitEthernet0/0/1

ACL: 2036 Address group: 1 Port-preserved: Y

NO-PAT: N Reversible: N

Rule name: ruleoutbound1

Priority: 1000

Config status: Active

Interface: GigabitEthernet1/0/2

ACL: 2037 Address group: 2 Port-preserved: N

NO-PAT: Y Reversible: Y

VPN instance: vpn_nat

Rule name: ruleoutbound2

Priority: 1000

Config status: Inactive

Reasons for inactive status:

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

Table 10 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 configuration, this field displays hyphens (---).
Address group	Address group used by the outbound dynamic NAT rule. If no address group is specified for address translation, the field displays hyphens (---).
Port-preserved	Whether to try to preserve the port numbers for PAT.
NO-PAT	Whether NO-PAT is used: · Y—NO-PAT is used. · N—PAT is used.
Reversible	Whether reverse address translation is allowed: · Y—Reverse address translation is allowed. · N—Reverse address translation is not allowed.
VPN instance	MPLS L3VPN instance to which the NAT address group belongs. If the NAT address group does not belong to any VPN instance, the field is not displayed.
Rule name	Name of the NAT rule.
Priority	Priority of the NAT rule.
Config status	Status of the outbound dynamic NAT configuration: Active or Inactive.
Reasons for inactive status	Reasons why the outbound dynamic NAT configuration does not take effect. This field is available when the Config status is Inactive. The following are possible reasons that the system will display: · The following items don't exist or aren't effective: global VPN, interface IP address, address group, and ACL. · NAT address conflicts.

Related commands

nat outbound

display nat outbound port-block-group

Use display nat outbound port-block-group to display static outbound port block group 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: GigabitEthernet1/0/2

Rule name: rule1

port-block-group: 2

Config status : Active

Interface: GigabitEthernet1/0/2

port-block-group: 10

Rule name: rule2

Config status : Inactive

Reasons for inactive status:

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

Table 11 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 mapping rule.
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

display nat port-block { dynamic | static } [ ip ipv4-source-address ] [ slot slot-number ] [ verbose ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

dynamic: Displays dynamic port block mappings.

static: Displays static port block mappings.

ip ipv4-source-address: Specifies a source IPv4 address. The IPv4 address must be the private source IPv4 address in a port block mapping.

slot slot-number: Specifies a card by its slot number. If you do not specify a card, this command displays port block mappings for all cards.

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

Examples

# 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 Extend

--- 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 ---

vpn012345678 100.100.100.113 202.202.100.101 10769-11024 0 ---

901234567890

1234567

--- 100.100.100.114 0.0.0.0 --- 0 ---

Total mappings found: 5

# Display dynamic port block mappings.

<Sysname> display nat port-block dynamic slot 1

Slot 1:

Local VPN Local IP Global IP Port block Connections Extend

--- 101.1.1.12 192.168.135.201 10001-11024 1 ---

Total mappings found: 1

# Display detailed information about dynamic port block mappings for the specified slot.

<Sysname> display nat port-block dynamic slot 1 verbose

Slot 1:

Dynamic port block entry

Local IP : 200.1.24.219

Local vpn : ---(0)

Global IP : 202.2.1.8

Global vpn : ---(0)

Port block : 24774-26023

Connections : 0

FailgroupID : 16

PortLimit TCP : N/A

PortLimit UDP : N/A

PortLimit ICMP : N/A

PortLimit total : 100

PortUsed TCP : 0

PortUsed UDP : 0

PortUsed ICMP : 0

PortUsed total : 0

Extend port block: N

Dynamic port block entry

Local IP : 200.1.40.231

Local vpn : ---(0)

Global IP : 202.2.1.10

Global vpn : ---(0)

Port block : 32274-33523

Connections : 0

FailgroupID : 16

PortLimit TCP : N/A

PortLimit UDP : N/A

PortLimit ICMP : N/A

PortLimit total : 100

PortUsed TCP : 0

PortUsed UDP : 0

PortUsed ICMP : 0

PortUsed total : 0

Extend port block: N

Total mappings found: 2

# Display detailed information about static port block mappings for the specified slot.

<Sysname> display nat port-block static slot 1 verbose

Slot 1:

Static port block entry

Local IP : 200.1.24.219

Local vpn : ---(0)

Global IP : 202.2.1.8

Global vpn : ---(0)

Port block : 24774-26023

Connections : 0

FailgroupID : 16

PortLimit TCP : N/A

PortLimit UDP : N/A

PortLimit ICMP : N/A

PortLimit total : 100

PortUsed TCP : 0

PortUsed UDP : 0

PortUsed ICMP : 0

PortUsed total : 0

Extend port block: N

Static port block entry

Local IP : 200.1.40.231

Local vpn : ---(0)

Global IP : 0.0.0.0

Global vpn : ---(0)

Port block : ---

Connections : 0

FailgroupID : 16

PortLimit TCP : N/A

PortLimit UDP : N/A

PortLimit ICMP : N/A

PortLimit total : 100

PortUsed TCP : 0

PortUsed UDP : 0

PortUsed ICMP : 0

PortUsed total : 0

Extend port block: N

Total mappings found: 2

Table 12 Command output

Field	Description
Local VPN	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. If no public address is allocated due to insufficient public network resources, this field displays 0.0.0.0.
Port block	Port block defined by a start port and an end port. If public network resources are insufficient, this field displays hyphens (---).
Connections	Number of connections established by using the ports in the port block.
Extend	Number of extended port blocks. If no extended port blocks are configured, this field displays hyphens (---).
Total mappings found	Total number of port block mappings.

Table 13 Command output

Field	Description
Local IP	Private IP address.
Local vpn	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 ---(0).
Global IP	Global IP address. If no public address is allocated due to insufficient public network resources, this field displays 0.0.0.0.
Global vpn	MPLS L3VPN instance to which the global IP address belongs. If the global IP address does not belong to any VPN instance, this field displays ---(0).
Port block	Port block defined by a start port number and an end port number. If public network resources are insufficient, this field displays hyphens (---).
Connections	Number of connections established by using the ports in the port block.
PortLimit TCP	Maximum number of ports that can be assigned to TCP.
PortLimit UDP	Maximum number of ports that can be assigned to UDP.
PortLimit ICMP	Maximum number of ports that can be assigned to ICMP.
PortLimit total	Maximum number of ports that are available for assignment.
PortUsed TCP	Number of ports assigned to TCP packets.
PortUsed UDP	Number of ports assigned to UDP packets.
PortUsed ICMP	Number of ports assigned to ICMP packets.
PortUsed total	Total number of ports in use.
Extend port block	Number of extended port blocks. If no extended port blocks are configured, this field displays N.
Total mappings found	Total number of port block mappings.

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 vpna

192.168.3.1 192.168.3.254 vpna

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 vpnb

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 vpna

192.168.3.1 192.168.3.254 vpna

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 14 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 NAT 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 private IP addresses.
Global IP pool information	Information about 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	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 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

# Display NAT server mappings.

<Sysname> display nat server

NAT internal server information:

Totally 5 internal servers.

Interface: GigabitEthernet0/0/1

Global ACL : 2000

Local IP/port : 192.168.10.1/23

Rule name : rule1

Priority : 1000

Config status : Active

Interface: GigabitEthernet0/0/3

Protocol: 6(TCP)

Global IP/port: 50.1.1.1/23

Local IP/port : 192.168.10.15/23

Rule name : rule2

Config status : Active

Interface: GigabitEthernet0/0/4

Protocol: 6(TCP)

Global IP/port: 50.1.1.1/23-30

Local IP/port : 192.168.10.15-192.168.10.22/23

Global VPN : vpn1

Local VPN : vpn3

Rule name : rule3

Config status : Inactive

Reasons for inactive status:

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

Interface: GigabitEthernet0/0/4

Protocol: 255(Reserved)

Global IP/port: 50.1.1.100/---

Local IP/port : 192.168.10.150/---

Global VPN : vpn2

Local VPN : vpn4

Rule name : rule4

Config status : Active

Interface: GigabitEthernet0/0/5

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)

Global VPN : vpn1

Local VPN : vpn10

Rule name : rule5

Config status : Active

NAT Instance: instance1

Protocol: 6(TCP)

Global IP/port: 1.1.1.1/0

Local IP/port : 2.2.2.2/0

Config status : Active

Table 15 Command output

Field	Description
NAT internal server information	Information about NAT server mappings.
Totally n internal servers	Total number of NAT server mappings.
Interface	Interface where NAT server mapping is configured.
NAT Instance	NAT instance of the NAT server mapping.
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 mapping, 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 load sharing NAT server mapping, this field displays the internal server group ID, IP address, port number, and number of connections of each member.
Global VPN	MPLS L3VPN instance to which the public IP addresses belong. If the public IP addresses do not belong to any VPN instance, this field is not displayed.
Local VPN	MPLS L3VPN instance to which the private IP addresses belong. If the private IP addresses do not belong to any VPN instance, this field is not displayed.
ACL	ACL number or name. If no ACL is specified, this field is not displayed.
Rule name	Name of the NAT server mapping.
Priority	Priority of the NAT server mapping.
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. The following are possible reasons that the system will display: · The following items don't exist or aren't effective: global VPN, interface IP address, server group, and ACL. · Server configuration conflicts. · NAT address conflicts.

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 is 0 to 65535. If you do not specify this argument, the command displays configuration about all internal server groups.

Examples

# Display configuration about 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 configuration about 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 16 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 member in the internal server group. If no address is specified, this field displays hyphens (---).
Port	Private port number of a member in the internal server group. If no port number is specified, this field displays hyphens (---).
Weight	Weight of a member 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

display nat session [ { source-ip source-ip | destination-ip destination-ip } * [ vpn-instance vpn-instance-name ] ] [ slot slot-number ] [ brief | verbose ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

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.

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. The VPN must be the VPN inside the packet. If you do not specify a VPN instance, this command displays NAT sessions that do not belong to any VPN instance.

slot slot-number: Specifies a card by its slot number. If you do not specify a card, this command displays NAT sessions for all cards.

brief: Display brief information about NAT sessions.

verbose: Display 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 detailed information about all NAT sessions.

Examples

# 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/VLL ID: -/-/-

Protocol: TCP(6)

Inbound interface: GigabitEthernet0/0/1

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: GigabitEthernet0/0/2

Source security zone: DestZone

State: TCP_SYN_SENT

Application: SSH

Start time: 2019-07-29 19:12:36

Initiator->Responder: 1 packets 48 bytes

Responder->Initiator: 0 packets 0 bytes

Total sessions found: 1

# Display detailed information about NAT sessions for CPU 0 on the specified slot.

<Sysname> display nat session slot 1 cpu 0 verbose

CPU 0 on 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/VLL ID: -/-/-

Protocol: TCP(6)

Inbound interface: GigabitEthernet0/0/1

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: GigabitEthernet0/0/2

Source security zone: DestZone

State: TCP_SYN_SENT

Application: SSH

Start time: 2019-07-29 19:12:36

Initiator->Responder: 1 packets 48 bytes

Responder->Initiator: 0 packets 0 bytes

Total sessions found: 1

# Display brief information about NAT sessions for the specified slot.

<Sysname> display nat session slot 1 brief

Slot 1:

Protocol Source IP/port Destination IP/port Global IP/port

TCP 10.2.1.58/2477 20.1.1.2/1025 30.2.4.9/226

Total sessions found: 1

Table 17 Command output

Field	Description
CPU	Number of the CPU.
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/VLL ID	The fields identify the following information: · VPN instance—MPLS L3VPN instance to which the session belongs. ‌ · VLAN ID—VLAN to which the session belongs for Layer 2 forwarding. · VLL ID—INLINE to which the session belongs for Layer 2 forwarding. If no VPN instance, VLAN ID, or VLL ID is specified, a hyphen (-) is displayed for the related field.
Protocol	Transport layer protocol type: DCCP, ICMP, Raw IP, SCTP, TCP, UDP, or UDP-Lite.
Inbound interface	Input interface.
Source security zone	Security zone to which the input interface belongs. If the input interface does not belong to any security zone, this field displays a hyphen (-).
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.
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.
Source IP/port	Source IP address and port number of the initiator.
Destination IP/port	Destination IP address and port number of the initiator.
Global IP/port	Public IP address and port number.

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

# 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

Global VPN : vpn2

Local VPN : vpn1

ACL : 2000

Reversible : Y

Rule name : ruleinbound1

Priority : 1000

Config status: Active

IP-to-IP:

Global IP : 5.5.5.5

Local IP : 4.4.4.4

Global VPN : vpn3

Local VPN : vpn4

ACL : 2001

Reversible : Y

Rule name : ruleinbound2

Priority : 1000

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

Local VPN : vpn1

Global VPN : vpn2

ACL : 2000

Reversible : Y

Rule name : ruleout1

Priority : 1000

Config status: Active

IP-to-IP:

Local IP : 4.4.4.4

Global IP : 5.5.5.5

Local VPN : vpn4

Global VPN : vpn3

ACL: : 2000

Reversible : Y

Rule name : ruleout2

Priority : 1000

Config status: Inactive

Reasons for inactive status:

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

Interfaces enabled with static NAT:

Totally 2 interfaces enabled with static NAT.

Interface: GigabitEthernet1/0/2

Config status: Active

Interface: GigabitEthernet0/0/3

Config status: Active

Table 18 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.
Local VPN	MPLS L3VPN instance to which the private IP addresses belong. If the private IP addresses do not belong to any VPN instance, this field is not displayed.
Global VPN	MPLS L3VPN instance to which the public IP addresses belong. If the public IP addresses do not belong to any VPN instance, this field is not displayed.
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 static NAT mapping.
Priority	Priority of the static NAT mapping.
Config status	Status of the static NAT mapping configuration: Active or Inactive.
Reasons for inactive status	Reasons why the static NAT mapping configuration does not take effect. This field is available when the Config status is Inactive. The following are possible reasons that the system will display: · The following items don't exist or aren't effective: local VPN, global VPN, and ACL. · NAT address conflicts.

Related commands

nat static

nat static net-to-net

nat static enable

display nat statistics

Use display nat statistics to display NAT statistics.

Syntax

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 a card by its slot number. If you do not specify a card, this command displays NAT statistics for all cards.

Examples

# Display detailed information about NAT statistics.

<Sysname> display nat statistics

Slot 1:

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

# Display detailed information about all NAT statistics.

<Sysname> display nat statistics

CPU 0 on slot 1:

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

Table 19 Command output

Field	Description
Total session entries	Number of NAT session entries.
Total EIM entries	Number of EIM entries.
Total inbound NO-PAT entries	Number of inbound NO-PAT entries.
Total outbound NO-PAT entries	Number of outbound NO-PAT entries.
Total static port block entries	Number of static port block mappings.
Total dynamic port block entries	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.

# Display summary information about NAT statistics.

<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

# Display summary information about NAT statistics.

<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 CPU Sessions EIM SPB DPB ASPB ADPB

2 1 0 0 0 1572720 0 0

Table 20 Command output

Field	Description
CPU	Number of the CPU.
Sessions	Number of NAT session entries.
EIM	Number of EIM entries.
SPB	Number of static port block 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

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 256 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. 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 [ vpn-instance vpn-instance-name ]

undo local-ip-address start-address end-address [ vpn-instance vpn-instance-name ]

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.

vpn-instance vpn-instance-name: Specifies the MPLS L3VPN instance to which the private IP address range belongs. The vpn-instance-name argument is a case-sensitive string of 1 to 31 characters. If the private IP address range does not belong to any VPN instance, do not specify this option.

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.

You can add multiple private IP address ranges to the same port block group.

· The private IP address ranges in the same VPN instance cannot overlap.

· The private IP address ranges that do not belong to any VPN instances cannot overlap.

When you add private IP address ranges to different port block groups with the same VPN instance, make sure the IP address ranges do not overlap.

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 in VPN instance vpn1.

<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 vpn-instance vpn1

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

undo nat address-group group-id

Default

No NAT address groups exist.

Views

System view

Predefined user roles

network-admin

Parameters

group-id: Assigns an ID to the NAT address group. The value range for this argument varies by device model.

Usage guidelines

A NAT address group consists of multiple address ranges. Use the address command to add an address range to a NAT address group.

Examples

# Create a NAT address group numbered 1.

<Sysname> system-view

[Sysname] nat address-group 1

Related commands

address

display nat address-group

display nat all

nat inbound

nat outbound

nat address-group ip-overlap enable

Use nat address-group ip-overlap enable to enable the support for IP overlapping NAT address groups.

Use undo nat address-group ip-overlap enable to restore the default.

Syntax

nat address-group ip-overlap enable

undo nat address-group ip-overlap enable

Default

Overlapping addresses in different NAT address groups are not supported.

Views

System view

Predefined user roles

network-admin

Usage guidelines

To allow VPC users in different VPN instances to access the public network, use different NAT address groups as a best practice. If the public address resources are not sufficient, execute this command to allow overlapping address ranges among NAT address groups.

With this feature enabled, NAT address groups cannot have overlapping IP addresses if multiple address translation rules are configured for users in the same VPN instance. Otherwise, the NAT service might not operate correctly.

Before you execute the undo nat address-group ip-overlap enable command, you must first remove all NAT address groups.

Examples

# Enable the support for IP overlapping NAT address groups.

<Sysname> system-view

[Sysname] nat address-group ip-overlap enable

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, PPTP, and RTSP, 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

The 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. If a DNS mapping is configured, the device 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 hairpin enable

Use nat hairpin enable to enable NAT hairpin.

Use undo nat hairpin enable to disable NAT hairpin.

Syntax

nat hairpin enable

undo nat hairpin enable

Default

NAT hairpin is disabled.

Views

Interface view

Predefined user roles

network-admin

Usage guidelines

NAT hairpin allows internal hosts to access each other or allows internal hosts to access internal servers. It must cooperate with NAT Server, outbound dynamic NAT, or outbound static NAT. The source and destination IP addresses of the packets are translated on the interface connected to the internal network.

Examples

# Enable NAT hairpin on GigabitEthernet 0/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 0/0/1

[Sysname-GigabitEthernet0/0/1] nat hairpin enable

Related commands

display nat all

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 [ vpn-instance vpn-instance-name ] [ no-pat [ reversible ] [ add-route ] ] [ rule rule-name ] [ priority priority ]

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. The value range for the group-id argument is 0 to 65535.

vpn-instance vpn-instance-name: Specifies the MPLS L3VPN instance to which the addresses in the address group belong. The vpn-instance-name argument is a case-sensitive string of 1 to 31 characters. If the addresses in the address group do not belong to any VPN instance, do not specify this option.

no-pat: Uses NO-PAT for inbound NAT. 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.

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 PAT and NO-PAT 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.

· 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.

The vpn-instance parameter is required if you deploy inbound dynamic NAT for VPNs. The specified VPN instance must be the VPN instance to which the NAT interface belongs.

If the inbound dynamic NAT rules have the same priority value, the device uses the following rules to determine their match order:

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

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

· NAT rules with numbered 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 in VPN vpn10 to pass through.

<Sysname> system-view

[Sysname] acl basic 2001

[Sysname-acl-ipv4-basic-2001] rule permit vpn-instance vpn10 source 10.110.10.0 0.0.0.255

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

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

# Configure the MPLS L3VPN instance named vpn10.

[Sysname] ip vpn-instance vpn10

[Sysname-vpn-instance-vpn10] route-distinguisher 100:001

[Sysname-vpn-instance-vpn10] vpn-target 100:1 export-extcommunity

[Sysname-vpn-instance-vpn10] vpn-target 100:1 import-extcommunity

[Sysname-vpn-instance-vpn10] 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 GigabitEthernet 0/0/1. 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 gigabitethernet 0/0/1

[Sysname-GigabitEthernet0/0/1] nat inbound 2001 address-group 1 vpn-instance vpn10 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

Default

The priority of a rule is determined by its location on the rule list. A NAT rule appearing earlier on the rule list has a higher priority for packet matching.

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 does not change. 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 does not change. 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 gigabitethernet 0/0/1

[Sysname-GigabitEthernet0/0/1] nat inbound rule move abc before def

Related commands

nat inbound

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, NAT user logging, or NAT alarm 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 flow-active

nat log flow-begin

nat log flow-end

nat log port-alloc-fail

nat log port-block-alloc-fail

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.

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

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

This command takes effect only after you use the nat log enable command to 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-alloc-fail

Use nat log port-alloc-fail to enable logging for NAT port allocation failures.

Use undo nat log port-alloc-fail to disable logging for NAT port allocation failures.

Syntax

nat log port-alloc-fail

undo nat log port-alloc-fail

Default

Logging for NAT port allocation failures is disabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

This feature enables the device to generate logs when port allocation fails in dynamic NAT. Typically, the failure is caused by the fact that all ports are occupied in a port block.

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

Examples

# Enable logging for NAT port allocation failures.

<Sysname> system-view

[Sysname] nat log port-alloc-fail

Related commands

display nat all

display nat log

nat log enable

nat log port-block port-usage threshold

Use nat log port-block port-usage threshold to enable logging for port usage in port blocks and set the usage threshold.

Use undo nat log port-block port-usage threshold to disable logging for port usage in port blocks.

Syntax

nat log port-block port-usage threshold value

undo nat log port-block port-usage threshold

Default

Logging for port usage in port blocks is disabled.

Views

System view

Predefined user roles

network-admin

Parameters

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

Usage guidelines

This feature enables the device to generate a log when the port usage in a port block exceeds the threshold.

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

Examples

# Enable logging for port usage in port blocks and set the threshold to 90%.

<Sysname> system-view

[Sysname] nat log port-block port-usage threshold 90

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.

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

Examples

# Set the port block usage threshold to 80%.

<Sysname> system-view

[Sysname] nat log port-block usage threshold 80

Related commands

display nat all

display nat log

nat log enable

nat log port-block-alloc-fail

Use nat log port-block-alloc-fail to enable logging for NAT port block assignment failures.

Use undo nat log port-block-alloc-fail to disable logging for NAT port block assignment failures.

Syntax

nat log port-block-alloc-fail

undo nat log port-block-alloc-fail

Default

Logging for NAT port block assignment failures is disabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

This feature enables the device to generate logs when the system fails to assign port blocks in dynamic NAT.

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

Examples

# Enable logging for NAT port allocation failures.

<Sysname> system-view

[Sysname] nat log port-block-alloc-fail

Related commands

display nat all

display nat log

nat log enable

nat log port-block-assign

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

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

Syntax

nat log port-block-assign

undo nat log port-block-assign

Default

NAT user logging is disabled for port block assignment.

Views

System view

Predefined user roles

network-admin

Usage guidelines

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

For dynamic port block mapping, the NAT 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 NAT 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 NAT user logging for port block withdrawal.

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

Syntax

nat log port-block-withdraw

undo nat log port-block-withdraw

Default

NAT user logging is disabled for port block withdrawal.

Views

System view

Predefined user roles

network-admin

Usage guidelines

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

For dynamic port block mapping, the NAT 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 NAT 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 mode for PAT.

Use undo nat mapping-behavior endpoint-independent 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 types of NAT mappings:

· 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 to FTP and HTTP packets, and the Address and Port-Dependent Mapping 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 [ vpn-instance vpn-instance-name ] no-pat [ reversible ] [ rule rule-name ] [ priority priority ]

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

PAT:

nat outbound [ ipv4-acl-number | name ipv4-acl-name ] [ address-group group-id ] [ vpn-instance vpn-instance-name ] [ port-preserved ] [ rule rule-name ] [ priority priority ]

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 group-id: Specifies an address group for NAT. The value range for the group-id argument is 0 to 65535. If you do not specify an address group, the IP address of the interface is used as the NAT address. Easy IP is used.

no-pat: Uses NO-PAT for outbound NAT. 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.

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

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.

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

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 configure multiple outbound dynamic NAT rules, only one outbound dynamic NAT rule can contain no ACL.

· 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.

· For dynamic port block mappings, make sure the ACL rules in a newly added NAT rule do not overlap with ACL rules in existing NAT rules that already have matching traffic.

A user is not allowed to access a service on an internal server through different external addresses or external port numbers. When configuring load sharing NAT Server, the number of members cannot be less than the value N in one of the following situations:

· A public address, N consecutive public port numbers, and one internal server group.

· N consecutive public addresses, a public port number, and one internal server group.

The vpn-instance parameter is required if you deploy outbound dynamic NAT for VPNs. The specified VPN instance must be the VPN instance to which the NAT interface belongs.

If the ACL-based outbound dynamic NAT rules have the same priority value, the device uses the following rules to determine their match order:

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

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

· NAT rules with numbered 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 GigabitEthernet 0/0/1 to translate the source addresses of outgoing packets permitted by ACL 2001 into the addresses in address group 1.

[Sysname] interface gigabitethernet 0/0/1

[Sysname-GigabitEthernet0/0/1] nat outbound 2001 address-group 1

[Sysname-GigabitEthernet0/0/1] quit

# Configure an outbound NO-PAT rule on GigabitEthernet 0/0/1 to translate the source addresses of outgoing packets permitted by ACL 2001 into the addresses in address group 1.

[Sysname] interface gigabitethernet 0/0/1

[Sysname-GigabitEthernet0/0/1] nat outbound 2001 address-group 1 no-pat

[Sysname-GigabitEthernet0/0/1] quit

# Enable Easy IP to use the IP address of GigabitEthernet 0/0/1 as the translated address.

[Sysname] interface gigabitethernet 0/0/1

[Sysname-GigabitEthernet 0/0/1] nat outbound 2001

[Sysname-GigabitEthernet 0/0/1] quit

# Configure an outbound NO-PAT rule on GigabitEthernet 0/0/1 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 gigabitethernet 0/0/1

[Sysname-GigabitEthernet0/0/1] 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 NAT 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 ]

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.

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 GigabitEthernet 0/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 0/0/1

[Sysname-GigabitEthernet0/0/1] nat outbound port-block-group 1

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

Default

The priority of a rule is determined by its location on the rule list. A NAT rule appearing earlier on the rule list has a higher priority for packet matching.

Views

Interface view

Predefined user roles

network-admin

Parameters

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

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 gigabitethernet 0/0/1

[Sysname-GigabitEthernet0/0/1] nat outbound rule move abc before def

Related commands

nat outbound

nat port-block flow-trigger enable

Use nat port-block flow-trigger enable to enable flow-triggered port block assignment.

Use undo nat port-block flow-trigger enable to disable flow-triggered port block assignment.

Syntax

nat port-block flow-trigger enable

undo nat port-block flow-trigger enable

Default

Flow-triggered port block assignment is disabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

The flow-triggered port block assignment feature is applicable to port block-based NAT. If unification is not configured between NAT and BRAS, you must enable this feature. If unification is configured, port block assignment is triggered when users come online.

You cannot modify the enabling status of flow-triggered port block assignment if a user is online or global NAT entries exist.

Examples

# Enable flow-triggered port block assignment.

<Sysname> system-view

[Sysname] nat port-block flow-trigger enable

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.

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 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

Default

The priority of a rule is determined by its location on the rule list. A NAT rule appearing earlier on the rule list has a higher priority for packet matching.

Views

Interface view

Predefined user roles

network-admin

Parameters

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

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 NAT server rules that use ACLs.

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 gigabitethernet 0/0/1

[Sysname-GigabitEthernet0/0/1] nat server rule move abc before def

Related commands

nat server

nat server (interface-based NAT)

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 one single public port:

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

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

· 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 [ vpn-instance global-vpn-instance-name ] inside { { local-address | local-address1 local-address2 } local-port | local-address local-port1 local-port2 } [ vpn-instance local-vpn-instance-name ] [ acl { ipv4-acl-number | name ipv4-acl-name } ] [ rule rule-name ]

undo nat server protocol pro-type global { global-address | current-interface | interface interface-type interface-number } global-port1 global-port2 [ vpn-instance global-vpn-instance-name ]

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

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

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

· Consecutive public addresses with one single public port:

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

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

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 } [ vpn-instance global-vpn-instance-name ] inside server-group group-id [ vpn-instance local-vpn-instance-name ] [ acl { ipv4-acl-number | name ipv4-acl-name } ] [ rule rule-name ]

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 } [ vpn-instance global-vpn-instance-name ]

ACL-based NAT server mapping:

nat server global { ipv4-acl-number | name ipv4-acl-name } inside local-address [ local-port ] [ vpn-instance local-vpn-instance-name ] [ rule rule-name ] [ priority priority ]

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, a NAT server mapping 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 external network information that the server uses to provide services to the external network.

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 256 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 256 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 internal 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.

vpn-instance global-vpn-instance-name: Specifies the MPLS L3VPN instance to which the advertised public IP addresses belong. The global-vpn-instance-name argument is a case-sensitive string of 1 to 31 characters. If the public IP addresses do not belong to any VPN instance, do not specify this option.

vpn-instance local-vpn-instance-name: Specifies the MPLS L3VPN instance to which the internal server belongs. The local-vpn-instance-name argument is a case-sensitive string of 1 to 31 characters. If the internal server does not belong to any VPN instance, do not specify this option.

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 this 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.

Usage guidelines

You can configure the NAT server mapping to allow internal servers (such as Web, FTP, Telnet, POP3, and DNS servers) in the internal network or an MPLS VPN instance 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 21 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 public addresses	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
Public addresses matching an ACL	One private address and one private port

The number of the nat server commands that can be configured on an interface varies by device model. 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.

The vpn-instance parameter is required if you deploy NAT Server for VPNs. The specified VPN instance must be the VPN instance to which the NAT interface belongs.

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 one public port number are mapped to one internal server group.

If the ACL-based NAT server mappings have the same priority value, the device uses the following rules to determine their match order:

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

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

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

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 gigabitethernet 0/0/1

[Sysname-GigabitEthernet0/0/1] nat server protocol tcp global 202.110.10.10 8080 inside 10.110.10.10 http

[Sysname-GigabitEthernet0/0/1] quit

# Allow external users to access the internal FTP server at 10.110.10.11 in the VPN instance vrf10 through ftp://202.110.10.10.

[Sysname] interface gigabitethernet 0/0/1

[Sysname-GigabitEthernet0/0/1] nat server protocol tcp global 202.110.10.10 21 inside 10.110.10.11 vpn-instance vrf10

[Sysname-GigabitEthernet0/0/1] quit

# Allow external hosts to ping the host at 10.110.10.12 in the VPN instance vrf10 by using the ping 202.110.10.11 command.

[Sysname] interface gigabitethernet 0/0/1

[Sysname-GigabitEthernet0/0/1] nat server protocol icmp global 202.110.10.11 inside 10.110.10.12 vpn-instance vrf10

[Sysname-GigabitEthernet0/0/1] quit

# Allow external hosts to access the Telnet services of internal servers at 10.110.10.1 to 10.110.10.100 in the VPN instance vrf10 through the public address 202.110.10.10 and port numbers from 1001 to 1100. As a result, a user can Telnet to 202.110.10.10:1001 to access 10.110.10.1, Telnet to 202.110.10.10:1002 to access 10.110.10.2, and so on.

[Sysname] interface gigabitethernet 0/0/1

[Sysname-GigabitEthernet0/0/1] nat server protocol tcp global 202.110.10.10 1001 1100 inside 10.110.10.1 10.110.10.100 telnet vpn-instance vrf10

# 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 gigabitethernet 0/0/1

[Sysname-GigabitEthernet0/0/1] nat server global 3000 inside 10.0.0.172

Related commands

display nat all

display 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 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 interface GigabitEthernet 0/0/1.

<Sysname> system-view

[Sysname] nat static outbound 192.168.1.1 2.2.2.2

[Sysname] interface gigabitethernet 0/0/1

[Sysname-GigabitEthernet0/0/1] 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 [ vpn-instance global-vpn-instance-name ] local-ip [ vpn-instance local-vpn-instance-name ] [ acl { ipv4-acl-number | name ipv4-acl-name } [ reversible ] ] [ rule rule-name ] [ priority priority ]

undo nat static inbound global-ip [ vpn-instance global-vpn-instance-name ] local-ip [ vpn-instance local-vpn-instance-name ]

Default

No NAT mappings exist.

Views

System view

Predefined user roles

network-admin

Parameters

global-ip: Specifies a public IP address.

vpn-instance global-vpn-instance-name: Specifies the MPLS L3VPN instance to which the public IP address belongs. The global-vpn-instance-name argument is a case-sensitive string of 1 to 31 characters. If the public IP address does not belong to any VPN instance, do not specify this option.

local-ip: Specifies a private IP address.

vpn-instance local-vpn-instance-name: Specifies the MPLS L3VPN instance to which the private IP address belongs. The local-vpn-instance-name argument is a case-sensitive string of 1 to 31 characters. If the private IP address does not belong to any VPN instance, do not specify this option.

acl: Specifies an ACL to identify packets for address translation.

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 internal network to the private IP address.

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.

The vpn-instance parameter is required if you deploy inbound static NAT for VPNs. The specified VPN instance must be the VPN instance to which the NAT interface belongs.

If the ACL-based inbound one-to-one static mappings have the same priority value, the device uses the following rules to determine their match order:

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

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

· Mappings with numbered 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 [ vpn-instance global-vpn-instance-name ] local local-network { mask-length | mask } [ vpn-instance local-vpn-instance-name ] [ acl { ipv4-acl-number | name ipv4-acl-name } [ reversible ] ] [ rule rule-name ] [ priority priority ]

undo nat static inbound net-to-net global-start-address global-end-address [ vpn-instance global-vpn-instance-name ] local local-network { mask-length | mask } [ vpn-instance local-vpn-instance-name ]

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.

vpn-instance global-vpn-instance-name: Specifies the MPLS L3VPN instance to which the public IP addresses belong. The global-vpn-instance-name argument is a case-sensitive string of 1 to 31 characters. If the public IP addresses do not belong to any VPN instance, do not specify this option.

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.

vpn-instance local-vpn-instance-name: Specifies the MPLS L3VPN instance to which the private network address belongs. The local-vpn-instance-name argument is a case-sensitive string of 1 to 31 characters. If the private network address does not belong to any VPN instance, do not specify this option.

acl: Specifies an ACL to identify packets for address translation.

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 internal network to the private IP addresses.

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 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.

The vpn-instance parameter is required if you deploy inbound static NAT for VPNs. The specified VPN instance must be the VPN instance to which the NAT interface belongs.

If the ACL-based inbound net-to-net static mappings have the same priority value, the device uses the following rules to determine their match order:

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

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

· Mappings with numbered 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

Default

The priority of a rule is determined by its location on the rule list. A NAT rule appearing earlier on the rule list has a higher priority for packet matching.

Views

System view

Predefined user roles

network-admin

Parameters

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

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

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 [ vpn-instance local-vpn-instance-name ] global-ip [ vpn-instance global-vpn-instance-name ] [ acl { ipv4-acl-number | name ipv4-acl-name } [ reversible ] ] [ rule rule-name ] [ priority priority ]

undo nat static outbound local-ip [ vpn-instance local-vpn-instance-name ] global-ip [ vpn-instance global-vpn-instance-name ]

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 identify packets for address translation.

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.

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 both are 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.

The vpn-instance parameter is required if you deploy outbound static NAT for VPNs. The specified VPN instance must be the VPN instance to which the NAT interface belongs.

If the ACL-based outbound one-to-one static mappings have the same priority value, the device uses the following rules to determine their match order:

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

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

· Mappings with numbered 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 [ vpn-instance local-vpn-instance-name ] global global-network { mask-length | mask } [ vpn-instance global-vpn-instance-name ] [ acl { ipv4-acl-number | name ipv4-acl-name } [ reversible ] ] [ rule rule-name ] [ priority priority ]

undo nat static outbound net-to-net local-start-address local-end-address [ vpn-instance local-vpn-instance-name ] global global-network { mask-length | mask } [ vpn-instance global-vpn-instance-name ]

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.

vpn-instance local-vpn-instance-name: Specifies the MPLS L3VPN instance to which the private IP addresses belong. The local-vpn-instance-name argument is a case-sensitive string of 1 to 31 characters. If the private IP addresses do not belong to any VPN instance, do not specify this option.

global-network: Specifies a public network address.

vpn-instance global-vpn-instance-name: Specifies the MPLS L3VPN instance to which the public network address belongs. The global-vpn-instance-name argument is a case-sensitive string of 1 to 31 characters. If the public network address does not belong to any VPN instance, do not specify this option.

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 identify packets for address translation.

ipv4-acl-number: Specifies an ACL 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 addresses.

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 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 both are 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.

The vpn-instance parameter is required if you deploy outbound static NAT for VPNs. The specified VPN instance must be the VPN instance to which the NAT interface belongs.

If the ACL-based outbound net-to-net static mappings have the same priority value, the device uses the following rules to determine their match order:

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

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

· Mappings with numbered 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

Default

The priority of a rule is determined by its location on the rule list. A NAT rule appearing earlier on the rule list has a higher priority for packet matching.

Views

System view

Predefined user roles

network-admin

Parameters

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

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 [ vpn-instance vpn-instance-name ]

undo nat timestamp delete [ vpn-instance vpn-instance-name ]

Default

The TCP SYN and SYN ACK packets carry the timestamp.

Views

System view

Predefined user roles

network-admin

Parameters

vpn-instance vpn-instance-name: Specifies the MPLS L3VPN to which the TCP SYN and SYN ACK packets belong. The vpn-instance-name argument is a case-sensitive string of 1 to 31 characters. If you do not specify this option, this command applies to TCP SYN and SYN ACK packets on the public network.

Usage guidelines

With this feature configured, the system deletes the timestamps from the TCP SYN and SYN ACK packets after dynamic address translation.

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 use the nat timestamp delete command.

You can enable this feature for multiple VPN instances by repeating the command with different VPN parameters.

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

# Enable the deletion of the timestamp for TCP SYN and SYN ACK packets on the VPN instance aa.

<Sysname> system-view

[Sysname] nat timestamp delete vpn-instance aa

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

Port block parameters are not 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 this 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 NAT gateway extends port blocks one by one for the private IP address.

Usage guidelines

To configure dynamic port block mapping, port block parameters are required in the NAT address group. When a private IP address initiates a connection to the public network, the NAT 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 NAT 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.

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 eim

Use reset nat eim to delete NAT EIM entries.

Syntax

reset nat eim [ protocol { tcp | udp } ] [ slot slot-number ]

Views

User view

Predefined user roles

network-admin

Parameters

protocol: Specifies a protocol by its type. If you do not specify this keyword, the command deletes NAT EIM entries of all protocol types.

tcp: Specifies the TCP protocol.

udp: Specifies the UDP protocol.

slot slot-number: Specifies a card by its slot number. If you do not specify a card, this command deletes NAT EIM entries for all cards.

Examples

# Delete NAT EIM entries for the specified slot.

<Sysname> reset nat eim slot 1

Related commands

display nat session

display nat eim statistics

nat mapping-behavior

reset nat session

Use reset nat session to clear NAT sessions.

Syntax

reset nat session [ protocol { tcp | udp } ] [ slot slot-number ]

Views

User view

Predefined user roles

network-admin

Parameters

protocol: Specifies a protocol by its type. If you do not specify this keyword, the command clears NAT sessions of all protocol types.

tcp: Specifies the TCP protocol.

udp: Specifies the UDP protocol.

slot slot-number: Specifies a card by its slot number. If you do not specify a card, this command clears NAT sessions for all cards.

Examples

# Clear NAT sessions for the specified slot.

<Sysname> reset nat session slot 1

Related commands

display nat session

18-NAT Command Reference

nat alg

nat log flow-active

nat mapping-behavior endpoint-independent

nat outbound port-block-group

nat server (interface-based NAT)

nat static enable

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