dynamic: Displays the domain name suffixes dynamically obtained through DHCP or other protocols. If you do not specify this keyword, the command displays the statically configured and dynamically obtained domain name suffixes.

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. If you do not specify a VPN instance, this command displays domain name suffixes for the public network.

Examples

# Display the statically configured and dynamically obtained domain name suffixes for the public network.

<Sysname> display dns domain

Type:

D: Dynamic S: Static

No. Type Domain suffix

1 S com

2 D net

Table 1 Command output

Field	Description
No.	Sequence number.
Type	Domain name suffix type: · S—A statically configured domain name suffix. · D—A domain name suffix dynamically obtained through DHCP or other protocols.
Domain suffix	Domain name suffixes.

Related commands

dns domain

display dns domain-rule

Use display dns domain-rule to display the domain name rules.

Syntax

display dns domain-rule { dynamic [ vpn-instance vpn-instance-name ] | static }

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

dynamic: Displays the dynamically obtained domain name rules.

static: Displays the manually configured domain name rules.

Examples

# Display the manually configured domain name rules.

<Sysname> display dns domain-rule static

Total rules: 1

ID VPN instance Domain name Rule Type Server Group

1 a.example.com Domain 1

Table 2 Command output

Field	Description
Total rules	Total number of the domain name rules configured manually.
ID	ID of the domain name rule.
VPN instance	VPN instance to which the domain name rule belongs. This field is empty if the domain name rule is on the public network.
Domain name	Domain name in the domain name rule.
Rule type	Domain name rule type: · Domain—The domain name in the query is exactly the same as a domain name in the rule. · Subdomain—The domain name in the query contains a subdomain name.
Server group	ID of the DNS server group

# Display the dynamically obtained domain name rules.

<Sysname> display dns domain-rule dynamic

Total rules: 1

Domain name Rule Type Rule source IP address

b.example.com Domain MEP 1.1.1.102

Table 3 Command output

Field	Description
Total rules	Total number of the domain name rules obtained dynamically.
Domain name	Domain name in the domain name rule.
Rule type	Domain name rule type: · Domain—The domain name in the query is exactly the same as a domain name in the rule. · Subdomain—The domain name in the query contains a subdomain name.
Rule source	Source of the dynamic domain name rule. This field only displays MEP, which means the domain name rule is obtained from the multi-access edge computing platform (MEP).
IP address	IP address of the DNS server in the domain name rule.

Related commands

dns domain-rule

display dns host

Use display dns host to display information about domain name-to-IP address mappings.

Syntax

display dns host [ ip | ipv6 ] [ vpn-instance vpn-instance-name ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

ip: Specifies type A queries. A type A query resolves a domain name to the mapped IPv4 address.

ipv6: Specifies type AAAA queries. A type AAAA query resolves a domain name to the mapped IPv6 address.

Usage guidelines

If you do not specify the ip or ipv6 keyword, this command displays domain name-to-IP address mappings of all query types.

Examples

# Display domain name-to-IP address mappings of all query types in the static domain name resolution table and dynamic domain name resolution cache for the public network.

<Sysname> display dns host

Type:

D: Dynamic S: Static

Total number: 4

No. Host name Type TTL Query type IP addresses OutInterface

1 a.example.com D 3132 A 192.168.10.1 -

192.168.10.2

192.168.10.3

2 b.example.com D 2400(a) A 100.10.23.1

3 c.example.com S - A 192.168.1.1

4 d.example.net S - AAAA FE80::4904:4448

# Display domain name-to-IP address mappings of all query types in DNS cache.

<Sysname> display dns host cache

Type:

C: Cached

Total number: 1

No. Host name Server IP Type TTL Query Type IP addresses

1 e.example.com 110.1.1.1 C 180 A 192.168.10.50

192.168.10.51

192.168.134.100

Table 4 Command output

Field	Description
No.	Sequence number.
Host name	Domain name.
Type	Domain name-to-IP address mapping type: · S—A static mapping configured by the ip host or ipv6 host command. · D—A mapping dynamically obtained through dynamic domain name resolution. · C—A mapping saved by DNS caching.
TTL	Time in seconds that a mapping can be stored in the cache. (a) means that the aging time is set by the dns host aging-time command. If the DNS entry is permanently valid, this field displays Infinite. For a static mapping, this field displays a hyphen (-).
Query type	Query type: A and AAAA.
IP addresses	Replied IP address: · For a type A query, the replied IP address is an IPv4 address. · For a type AAAA query, the replied IP address is an IPv6 address.
Server IP	IP address of the DNS server.
OutInterface	Output interface specified by an application for DNS protocol packets. This field displays a hyphen (-) if the application does not specify an output interface.

Related commands

ip host

ipv6 host

reset dns host

display dns server

Use display dns server to display IPv4 DNS server information.

Syntax

display dns server [ dynamic ] [ vpn-instance vpn-instance-name ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

dynamic: Displays IPv4 DNS server information dynamically obtained through DHCP or other protocols. If you do not specify this keyword, the command displays statically configured and dynamically obtained IPv4 DNS server information.

Examples

# Display IPv4 DNS server information for the public network.

<Sysname> display dns server

Type:

D: Dynamic S: Static

No. Type IP address

1 S 202.114.0.124

2 S 169.254.65.125

Table 5 Command output

Field	Description
No.	Sequence number.
Type	DNS server type: · S—A manually configured DNS server. · D—DNS server information dynamically obtained through DHCP or other protocols.
IP address	IPv4 address of the DNS server.

‌

Related commands

dns server

display dns server health status

Use display dns server health status to display health status of DNS servers.

Syntax

display dns server health status

Views

Any view

Predefined user roles

network-admin

network-operator

Examples

# Display health status of DNS servers.

<Sysname> display dns server health status

No. DNS server OutInterface VPN name Status

1 1.1.1.1 - vpn1 Up

2 2::1 - Up

3 FE80::1 - vpn1 Up

Table 6 Command output

Field	Description
No.	Sequence number.
DNS server	Address of the DNS server.
OutInterface	Output interface of the DNS server. This field is displayed only when the DNS server address is a local IPv6 link address.
VPN name	VPN instance name. If this field is empty, the domain name rule is on the public network.
Status	Result of the health check: · Up—The DNS server is available. · Down—The DNS server is unavailable.

Related commands

health-check enable

display dns server-group

Use display dns server-group to display information about DNS server groups.

Syntax

display dns server-group

Views

Any view

Predefined user roles

network-admin

network-operator

Examples

# Display information about DNS server groups.

<Sysname> display dns server-group

Total number of DNS server group: 1

ID VPN instance IP addresses Out interfaces Description

1 1.1.1.101 -

10.10.12.12 -

Table 7 Command output

Field	Description
Total number of DNS server group	Total number of DNS server groups.
ID	ID of the DNS server group.
VPN instance	VPN instance to which the DNS server group belongs. This field is empty if the DNS server group is on the public network.
IP addresses	IP address of the DNS server.
Out interfaces	Interfaces on which the DNS server forwards packets.
Description	Description for the DNS server group.

Related commands

dns server-group

display dns transparent host

Use display dns transparent host to display dynamic entries for domain name-to-IP address mappings recorded by DNS transparent proxy.

Syntax

display dns transparent host [ ip | ipv6 ] [ vpn-instance vpn-instance-name ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

ip: Specifies type A queries. A type A query resolves a domain name to the mapped IPv4 address.

ipv6: Specifies type AAAA queries. A type AAAA query resolves a domain name to the mapped IPv6 address.

Usage guidelines

If you do not specify the ip or ipv6 keyword, this command displays dynamic entries for domain name-to-IP address mappings of both query types recorded by DNS transparent proxy.

Examples

# Display dynamic entries for domain name-to-IP address mappings recorded by DNS transparent proxy.

<Sysname> display dns transparent host

Total number: 1

No. Host name Server TTL QType IP addresses OutInterface

1 sample.com 1.1.1.1 3132 A 192.168.10.1 --

Table 8 Command output

Field	Description
No.	Sequence number.
Host name	Domain name.
Server	IP address of the DNS server.
TTL	Time in seconds that a mapping can be stored in the cache.
QTYPE	Query type: A and AAAA.
IP addresses	Replied IP address: · For a type A query, the replied IP address is an IPv4 address. · For a type AAAA query, the replied IP address is an IPv6 address.
OutInterface	Output interface name. This field displays a hyphen (-) if no output interface is specified.

Related commands

dns transparent-proxy enable

display ipv6 dns server

Use display ipv6 dns server to display IPv6 DNS server information.

Syntax

display ipv6 dns server [ dynamic ] [ vpn-instance vpn-instance-name ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

dynamic: Displays IPv6 DNS server information dynamically obtained through DHCP or other protocols. If you do not specify this keyword, the command displays the statically configured and dynamically obtained IPv6 DNS server information.

Examples

# Display IPv6 DNS server information for the public network.

<Sysname> display ipv6 dns server

Type:

D: Dynamic S: Static

No. Type IPv6 address Outgoing Interface

1 S 2::2

Table 9 Command output

Field	Description
No.	Sequence number.
Type	DNS server type: · S—A manually configured DNS server. · D—DNS server information dynamically obtained through DHCP or other protocols.
IPv6 address	IPv6 address of the DNS server.
Outgoing Interface	Output interface.

Related commands

ipv6 dns server

dns domain

Use dns domain to configure a domain name suffix.

Use undo dns domain to delete the specified domain name suffix.

Syntax

dns domain domain-name [ vpn-instance vpn-instance-name ]

undo dns domain domain-name [ vpn-instance vpn-instance-name ]

Default

No domain name suffix is configured. Only the provided domain name is resolved.

Views

System view

Predefined user roles

network-admin

Parameters

domain-name: Specifies a domain name suffix. It is a dot-separated, case-insensitive string that can include letters, digits, hyphens (-), underscores (_), and dots (.), for example, example.com. The domain name suffix can include a maximum of 253 characters, and each separated string includes no more than 63 characters.

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. To configure a domain name suffix for the public network, do not specify this option.

Usage guidelines

For domain name resolution, the resolver automatically uses the suffix list to supply the missing part of an incomplete name entered by a user.

A domain name suffix applies to both IPv4 DNS and IPv6 DNS.

The system allows a maximum of 16 domain name suffixes for the public network or each VPN instance. You can specify domain name suffixes for both public network and VPN instances.

Examples

# Configure domain name suffix com for the public network.

<Sysname> system-view

[Sysname] dns domain com

Related commands

display dns domain

dns domain-rule

Use dns domain-rule to configure a domain name rule.

Use undo dns domain-rule to delete a domain name rule.

Syntax

dns domain-rule rule-id { domain-name domain-name | subdomain-name subdomain-name } [ vpn-instance vpn-instance-name ] server-group group-id

undo dns domain-rule rule-id [ domain-name domain-name | subdomain-name subdomain-name ]

Default

No domain name rule is configured.

Views

System view

Predefined user roles

network-admin

Parameters

rule-id: Specifies the ID of a domain name rule, in the range of 1 to 16.

domain-name domain-name: Specifies a domain name. It is a dot-separated, case-insensitive string that can include letters, digits, hyphens (-), underscores (_), and dots (.), for example, www.example.com. The domain name can include a maximum of 253 characters, and each separated string includes no more than 63 characters.

subdomain-name subdomain-name: Specifies a subdomain name. It is a dot-separated, case-insensitive string that can include letters, digits, hyphens (-), underscores (_), dots (.), and asterisk (*). The domain name suffix can include a maximum of 253 characters, and each separated string includes no more than 63 characters.

vpn-instance vpn-instance-name: Specifies the MPLS L3VPN instance to which the DNS client that sends DNS queries belongs. The vpn-instance-name argument is a case-sensitive string of 1 to 31 characters. If the DNS client belongs to the public network, do not specify this option.

server-group group-id: Specifies the ID of a DNS server group, in the range of 1 to 16. The DNS server group must already exist.

Usage guidelines

A domain name rule successfully matches a DNS query only if the domain name in the query is exactly the same as a domain name or subdomain name in the rule. When you specify a subdomain name in a rule, do not include an asterisk (*).

A domain name rule is uniquely identified by its ID and VPN instance. For one rule, you can repeat this command to bind a maximum of eight domain names and subdomain names to the same DNS server group.

To delete a domain name or subdomain name, execute the undo dns domain-rule command and specify the domain-name domain-name or subdomain-name subdomain-name option. To delete a rule, do not specify any domain name.

A domain name rule can be bound to only one DNS server group.

A user query can match only domain name rules that are in the same VPN instance or on the public network as the user.

A domain name rule and its bound DNS server group can be in different VPN instances, or one can be in a VPN instance and the other on the public network.

Examples

# Create domain name rule 1 and bind subdomain name .example.com and domain name www.example.com to DNS server group 1.

<Sysname> system-view

[Sysname] dns domain-rule 1 subdomain-name .example.com server-group 1

[Sysname] dns domain-rule 1 domain-name www.example.com server-group 1

Related commands

display dns domain-rule

dns server-group

dns dscp

Use dns dscp to set the DSCP value for DNS packets sent by a DNS client or DNS proxy.

Use undo dns dscp to restore the default.

Syntax

dns dscp dscp-value

undo dns dscp

Default

The DSCP value is 0 in DNS packets sent by a DNS client or DNS proxy.

Views

System view

Predefined user roles

network-admin

Parameters

dscp-value: Specifies the DSCP value in the range of 0 to 63.

Usage guidelines

The DSCP value of a packet specifies the priority level of the packet and affects the transmission priority of the packet. A bigger DSCP value represents a higher priority.

Examples

# Set the DSCP value to 30 for outgoing DNS packets.

<Sysname> system-view

[Sysname] dns dscp 30

dns host aging-time

Use dns host aging-time to set the aging time for a specified domain name.

Use undo dns host aging-time to restore the default.

Syntax

dns host host-name [ vpn-instance vpn-instance-name ] aging-time { time-value | infinite }

undo dns host host-name [ vpn-instance vpn-instance-name ] aging-time

Default

The aging time for a domain name is the TTL in the DNS reply.

Views

System view

Predefined user roles

network-admin

Parameters

host host-name: Specifies a domain name. It is a dot-separated, case-insensitive string that can include letters, digits, hyphens (-), underscores (_), and dots (.), for example, www.example.com. The domain name can include a maximum of 253 characters, and each separated string includes no more than 63 characters.

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. To specify a domain name on the public network, do not specify this option.

aging-time time-value: Specifies the aging time in seconds. The value range for this argument is 1 to 604800.

aging-time infinite: Specifies a permanently valid domain name.

Usage guidelines

The DNS server determines how long a DNS entry is valid, and the DNS cache device and DNS client obtain the aging information from DNS responses. To set the aging time, execute the dns host aging-time command.

With this command configured, the device searches the DNS cache and dynamic domain name resolution cache, and changes the TTL in all entries into the specified aging time.

To restore the default, execute the undo dns host aging-time command. The restored aging time is the original TTL in the DNS reply. The corresponding DNS entry is removed if the original TTL expires after executing the command.

You can set a maximum of 256 times of aging time for domain names.

Examples

# Set the aging time for domain name www.example.com on the public network to 3600 seconds.

<Sysname> system-view

[Sysname] dns host www.example.com aging-time 3600

Related commands

display arp timer aging

dns proxy enable

Use dns proxy enable to enable DNS proxy.

Use undo dns proxy enable to disable DNS proxy.

Syntax

dns proxy enable

undo dns proxy enable

Default

DNS proxy is disabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

This configuration applies to both IPv4 DNS and IPv6 DNS.

Examples

# Enable DNS proxy.

<Sysname> system-view

[Sysname] dns proxy enable

dns redirect enable

Use dns redirect enable to enable DNS redirection.

Use undo dns redirect enable to disable DNS redirection.

Syntax

dns redirect enable

undo dns redirect enable

Default

DNS redirection is disabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

With DNS redirection enabled, the device monitors the received DNS requests (only UDP packets are supported in the current software version) and resolves the source IP addresses, source port numbers, and domain names. Then the device searches for a matching domain name rule and redirects the request to the DNS server in the rule.

The device enabled with DNS redirection works as follows:

1. The device searches for a matching domain name rule.

¡ If a match is found, it replaces the destination IP address in the request with the IP address of the first reachable DNS server in the server group bound to the rule. Then the device forwards the request to the DNS server.

¡ If no match is found, the device does not redirect the DNS request.

2. The device records the replacement, including the source IP address, source port number, and requested server address in the DNS request, and the replaced server address

3. Upon receiving the DNS reply, the device replaces the source IP address in the reply with the original server address in the request.

This configuration applies to both IPv4 DNS redirection and IPv6 DNS redirection.

This command does not take effect on labeled DNS packets.

The dns redirect enable and dns transparent-proxy enable commands are mutually exclusive. After one command is executed, the other command cannot be executed.

Examples

# Enable DNS redirection.

<Sysname> system-view

[Sysname] dns redirect enable

Related commands

dns transparent-proxy enable

dns server

Use dns server to specify the IPv4 address of a DNS server.

Use undo dns server to remove the IPv4 address of a DNS server.

Syntax

dns server ip-address [ vpn-instance vpn-instance-name ]

undo dns server [ ip-address ] [ vpn-instance vpn-instance-name ]

Default

No DNS server IPv4 address is specified.

Views

System view

Interface view

Predefined user roles

network-admin

Parameters

ip-address: Specifies the IPv4 address of a DNS server. When you execute the undo form of the command in interface view, you must specify this argument.

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. To specify a DNS server IPv4 address for the public network, do not use this option.

Usage guidelines

The device sends a DNS query request to the DNS servers in the order their IPv4 addresses are specified.

The system allows a maximum of six DNS server IPv4 addresses for the public network or each VPN instance. You can specify DNS server IPv4 addresses for both public network and VPN instances.

If you do not specify an IPv4 address, the undo dns server command removes all DNS server IPv4 addresses for the public network or the specified VPN instance.

Examples

# Specify DNS server IPv4 address 172.16.1.1.

<Sysname> system-view

[Sysname] dns server 172.16.1.1

# Specify DNS server IPv4 address 172.16.1.1 on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] dns server 172.16.1.1

Related commands

display dns server

dns server (DNS server group view)

Use dns server to add an IPv4 DNS server to the DNS server group.

Use undo dns server to remove IPv4 DNS servers from the DNS server group.

Syntax

dns server ip-address

undo dns server [ ip-address ]

Default

No DNS servers exist in a DNS server group.

Views

DNS server group view

Predefined user roles

network-admin

Parameters

ip-address: Specifies the IPv4 address of a DNS server.

Usage guidelines

The device sends a DNS query to DNS servers of the DNS server group in the same order as the order displayed in the display this command output for the group.

A DNS server group supports a maximum of six IPv4 DNS server addresses.

If you do not specify the ip-address argument, the undo dns server command deletes all IPv4 addresses in the DNS server group.

Examples

# Add DNS server 172.16.1.1 to DNS server group 1.

<Sysname> system-view

[Sysname] dns server-group 1

[Sysname-dns-server-group-1] dns server 172.16.1.1

dns server-group

Use dns server-group to create a DNS server group and enter its view, or enter the view of an existing DNS server group.

Use undo dns server-group to delete the specified DNS server group.

Syntax

dns server-group group-id [ vpn-instance vpn-instance-name ]

undo dns server-group group-id

Default

No DNS server group exists.

Views

System view

Predefined user roles

network-admin

Parameters

group-id: Specifies the ID of a DNS server group, in the range of 1 to 16.

vpn-instance vpn-instance-name: Specifies the MPLS L3VPN instance to which the DNS server group belongs. The vpn-instance-name argument is a case-sensitive string of 1 to 31 characters. If you do not specify a VPN instance, the DNS server group is on the public network.

Usage guidelines

To allow the device to send queries to specific DNS servers, add the DNS servers to a DNS server group and bind the group to domain names in a domain name rule. When the device receives a user query and fails to find a local matching DNS entry, the device determines whether a matching domain name rule exists in the same VPN instance or on the public network as the user. If a matching rule exists, the device forwards the query to DNS servers in the DNS server group bound to the rule. If no matching rule exists, the device does not forward the query to DNS servers in DNS server groups.

Examples

# Create DNS server group 1.

<Sysname> system-view

[Sysname] dns server-group 1

[Sysname-dns-server-group-1]

Related commands

description

dns domain-rule

dns snooping enable

Use dns snooping enable to enable DNS snooping.

Use undo dns snooping enable to disable DNS snooping.

Syntax

dns snooping enable

undo dns snooping enable

Default

DNS snooping is disabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

Application scenarios

DNS snooping is applicable to scenarios where user traffic is filtered based on domain names.

Operating mechanism

Other modules (for example, the address object group module) can obtain the IP addresses corresponding to domain names through DNS snooping only after they send domain name subscription requests to the DNS module. If the domain name in a DNS request matches a subscribed domain name, the device records the DNS mapping after receiving the DNS reply, and reports the mapping to the corresponding module for traffic filtering.

If the domain name in a DNS request does not match any subscribed domain name, the device does not record the DNS mapping.

When the domain names subscribed to by other modules age out, the DNS module notifies the modules of deleting the corresponding DNS mappings to ensure accuracy.

Restrictions and guidelines

DNS snooping works only between the DNS client and DNS server, or the DNS client and DNS proxy.

The DNS snooping and DNS transparent proxy features cannot be both configured.

The DNS snooping feature cannot be used across VPNs. Make sure the input and output interfaces of DNS packets on the device belong to the same VPN.

Examples

# Enable DNS snooping.

<Sysname> system-view

[Sysname] dns snooping enable

Related commands

dns transparent-proxy enable

dns source-interface

Use dns source-interface to specify the source interface for DNS packets.

Use undo dns source-interface to restore the default.

Syntax

dns source-interface interface-type interface-number [ vpn-instance vpn-instance-name ]

undo dns source-interface interface-type interface-number [ vpn-instance vpn-instance-name ]

Default

No source interface is specified for DNS packets. The device uses the primary IP address of the output interface of the matching route as the source IP address for a DNS request.

Views

System view

Predefined user roles

network-admin

Parameters

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

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. To specify a source interface for the public network, do not use this option.

Usage guidelines

This configuration applies to both IPv4 and IPv6.

In IPv4 DNS, the device uses the primary IPv4 address of the specified source interface as the source IP address of a DNS query. In IPv6 DNS, the device selects an IPv6 address of the specified source interface as the source IP address of a DNS query. The method of selecting the IPv6 address is defined in RFC 3484.

The system allows only one source interface for the public network or each VPN instance. If you execute this command multiple times, the most recent configuration takes effect. You can specify source interfaces for both public network and VPN instances.

This command takes effect whether the source interface belongs to the VPN instance or not. As a best practice, specify an interface that belongs to the VPN instance as the source interface.

As a best practice, do not specify an automatically generated interface (for example, an automatic tunnel interface) as the source interface for DNS packets. Otherwise, configuration might fail or might be lost.

Examples

# Specify GigabitEthernet 1/0/1 as the source interface for DNS packets on the public network.

<Sysname> system-view

[Sysname] dns source-interface gigabitethernet 1/0/1

dns spoofing

Use dns spoofing to enable DNS spoofing and specify the IPv4 address for spoofing DNS requests.

Use undo dns spoofing to disable DNS spoofing.

Syntax

dns spoofing ip-address [ vpn-instance vpn-instance-name ]

undo dns spoofing ip-address [ vpn-instance vpn-instance-name ]

Default

DNS spoofing is disabled.

Views

System view

Predefined user roles

network-admin

Parameters

ip-address: Specifies the IPv4 address used to spoof DNS requests.

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. To enable DNS spoofing for the public network, do not specify this option.

Usage guidelines

Use the dns spoofing command together with the dns proxy enable command.

DNS spoofing functions when the DNS proxy does not know the DNS server address or cannot reach the DNS server. It enables the DNS proxy to spoof DNS queries of type A by responding with the specified IPv4 address.

The system allows only one replied IPv4 address for the public network or each VPN instance. If you execute this command multiple times, the most recent configuration takes effect. You can configure DNS spoofing for both public network and VPN instances.

Examples

# Enable DNS spoofing for the public network and specify IPv4 address 1.1.1.1 for spoofing DNS requests.

<Sysname> system-view

[Sysname] dns proxy enable

[Sysname] dns spoofing 1.1.1.1

Related commands

dns proxy enable

dns spoofing track

Use dns spoofing track to configure the DNS spoofing device to track the network mode of an output interface.

Use undo dns spoofing track to restore the default.

Syntax

dns spoofing track controller interface-type interface-number

undo dns spoofing track

The following compatibility matrix shows the support of MPUs for this command:

MPU model	Command compatibility
MSU-100	No
MSU-200	Yes
MSU-400-G	No

‌

Default

The DNS spoofing device does not track the network mode of an output interface.

Views

System view

Predefined user roles

network-admin

Parameters

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

Usage guidelines

Enable DNS spoofing by using the dns spoofing or ipv6 dns spoofing command before you configure this command.

If you execute this command multiple times, the most recent configuration takes effect.

Examples

# Configure the device to spoof DNS requests by using IP address 192.168.1.10, and to track the network mode of output interface Cellular 0/1.

<Sysname> system-view

[Sysname] dns proxy enable

[Sysname] dns spoofing 192.168.1.10

[Sysname] dns spoofing track controller cellular 0/1

Related commands

dns spoofing

ipv6 dns spoofing

dns transparent-proxy enable

Use dns transparent-proxy enable to enable DNS transparent proxy.

Use undo dns transparent-proxy enable to disable DNS transparent proxy.

Syntax

dns transparent-proxy enable

undo dns transparent-proxy enable

Default

DNS transparent proxy is disabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

DNS transparent proxy modifies the source address in DNS requests so that the DNS client seems to receive a DNS reply directly from the DNS server. This feature is applicable to domain name-based policies, such as security policies and bandwidth policies.

The DNS client does not configure the DNS server address as the DNS transparent proxy address, which simplifies the DNS client configuration. As a best practice, enable DNS transparent proxy in some load balancing scenarios.

The device enabled with DNS transparent proxy monitors received DNS requests and replies and records DNS mappings as follows:

1. The device monitors all received DNS packets. Upon receiving a DNS request, the device specifies a local IP address that can reach the DNS server as the source IP address for the request.

2. Upon receiving the DNS reply, the device records the DNS mapping and forwards the reply to the DNS client.

3. The device searches the local entries after receiving another request. If a match is found, the device returns a DNS reply to the client. If no match is found, the device forwards the query to the DNS server for domain name resolution.

The dns transparent-proxy enable command is mutually exclusive with the following commands:

· dns redirect enable

· dns snooping enable

The DNS transparent proxy feature cannot be used across VPNs. Make sure the input and output interfaces of DNS packets on the device belong to the same VPN.

Examples

# Enable DNS transparent proxy.

<Sysname> system-view

[Sysname] dns transparent-proxy enable

Related commands

dns proxy enable

dns redirect enable

dns snooping enable

dns trust-interface

Use dns trust-interface to specify a DNS trusted interface.

Use undo dns trust-interface to remove a DNS trusted interface.

Syntax

dns trust-interface interface-type interface-number

undo dns trust-interface [ interface-type interface-number ]

Default

No DNS trusted interface is specified.

Views

System view

Predefined user roles

network-admin

Parameters

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

Usage guidelines

By default, an interface obtains DNS suffix and DNS server information from DHCP. A network attacker might act as the DHCP server to assign a wrong DNS suffix and DNS server address to the device. As a result, the device fails to obtain the resolved IP address or might get the wrong IP address. With the DNS trusted interface specified, the device only uses the DNS suffix and DNS server information obtained through the trusted interface to avoid attacks.

This configuration applies to both IPv4 DNS and IPv6 DNS.

You can configure a maximum of 128 DNS trusted interfaces on the device.

If you do not specify an interface, the undo dns trust-interface command removes all DNS trusted interfaces and restores the default.

Examples

# Specify GigabitEthernet 1/0/1 as a DNS trusted interface.

<Sysname> system-view

[Sysname] dns trust-interface gigabitethernet 1/0/1

health-check enable

Use health-check enable to enable DNS server health check.

Use undo health-check enable to disable DNS server health check.

Syntax

health-check enable

undo health-check enable

Default

DNS server health check is disabled.

Views

DNS server group view

Predefined user roles

network-admin

Usage guidelines

When the device enabled with DNS redirection receives a DNS request that matches a domain name rule, the device forwards the request to a DNS server. The DNS server is selected according to the server order displayed in the display this command.

If the device does not receive a DNS reply from the DNS server within two seconds, it reselects a DNS server. To prevent the device from selecting an unavailable DNS server, execute the health-check enable command to detect the availability of DNS servers. After you execute the command on the device, it works as follows:

1. The device periodically sends a DNS request to each DNS server in the DNS server group.

2. If the device receives a DNS reply from a DNS server, it regards the DNS server available.

3. If the device does not receive any DNS reply from a DNS server after it sends a DNS request to the DNS server for three consecutive times, it regards the DNS server unavailable.

4. Upon receiving a DNS request that matches a domain name rule, the device ignores the unavailable DNS servers automatically and selects a DNS server according to the lexicographical order.

Examples

# Enable health check for DNS servers in DNS server group 1.

<Sysname> system-view

[Sysname] dns server-group 1

[Sysname-server-group-1] health-check enable

ip host

Use ip host to create a host name-to-IPv4 address mapping.

Use undo ip host to remove a host name-to-IPv4 address mapping.

Syntax

ip host host-name ip-address [ vpn-instance vpn-instance-name ]

undo ip host host-name ip-address [ vpn-instance vpn-instance-name ]

Default

No host name-to-IPv4 address mappings exist.

Views

System view

Predefined user roles

network-admin

Parameters

host-name: Specifies a host name, a case-insensitive string of 1 to 253 characters that can contain letters, digits, hyphens (-), underscores (_), and dots (.). A host name must meet the following requirements:

· The host name string is separated by dots (.). Each separated part includes up to 63 characters.

· The host name cannot start or end with a dot (.).

· The host name cannot contain two consecutive dots (..).

ip-address: Specifies the IPv4 address of the host.

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. To create a host name-to-IP address mapping for the public network, do not specify this option.

Usage guidelines

The system allows a maximum of 1024 host name-to-IPv4 address mappings for the public network or each VPN instance. You can configure host name-to-IPv4 address mappings for both public network and VPN instances.

For the public network or a VPN instance, each host name maps to only one IPv4 address. If you execute this command multiple times, the most recent configuration takes effect.

Do not use the ping command parameter ip, -a, -c, -f, -h, -i, -m, -n, -p, -q, -r, -s, -t, -tos, -v, or -vpn-instance as the host name. For more information about the ping command parameters, see Network Management and Monitoring Command Reference.

Examples

# Map IPv4 address 10.110.0.1 to host name aaa for the public network.

<Sysname> system-view

[Sysname] ip host aaa 10.110.0.1

Related commands

display dns host

ipv6 dns dscp

Use ipv6 dns dscp to set the DSCP value for IPv6 DNS packets sent by an IPv6 DNS client or IPv6 DNS proxy.

Use undo ipv6 dns dscp to restore the default.

Syntax

ipv6 dns dscp dscp-value

undo ipv6 dns dscp

Default

The DSCP value is 0 in IPv6 DNS packets sent by an IPv6 DNS client or IPv6 DNS proxy.

Views

System view

Predefined user roles

network-admin

Parameters

dscp-value: Specifies the DSCP value in the range of 0 to 63.

Usage guidelines

The DSCP value of a packet specifies the priority level of the packet and affects the transmission priority of the packet. A bigger DSCP value represents a higher priority.

Examples

# Set the DSCP value to 30 for outgoing IPv6 DNS packets.

<Sysname> system-view

[Sysname] ipv6 dns dscp 30

ipv6 dns server

Use ipv6 dns server to specify the IPv6 address of a DNS server.

Use undo ipv6 dns server to remove the IPv6 address of a DNS server.

Syntax

ipv6 dns server ipv6-address [ interface-type interface-number ] [ vpn-instance vpn-instance-name ]

undo ipv6 dns server [ ipv6-address [ interface-type interface-number ] ] [ vpn-instance vpn-instance-name ]

Default

No DNS server IPv6 address is specified.

Views

System view

Predefined user roles

network-admin

Parameters

ipv6-address: Specifies the IPv6 address of a DNS server.

interface-type interface-number: Specifies the output interface by its type and number. If you do not specify an interface, the device forwards DNS packets out of the output interface of the matching route. Specify this argument if the IPv6 address of the DNS server is a link-local address. Do not specify this argument if the IPv6 address of the DNS server is a global unicast address.

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. To specify a DNS server IPv6 address for the public network, do not use this option.

Usage guidelines

For dynamic DNS, the device sends a DNS query request to the DNS servers in the order their IPv6 addresses are specified.

The system allows a maximum of six DNS server IPv6 addresses for the public network or each VPN instance. You can specify DNS server IPv6 addresses for both public network and VPN instances.

If you do not specify an IPv6 address, the undo ipv6 dns server command removes all DNS server IPv6 addresses for the public network or the specified VPN instance.

Examples

# Specify DNS server IPv6 address 2002::1 for the public network.

<Sysname> system-view

[Sysname] ipv6 dns server 2002::1

Related commands

display ipv6 dns server

ipv6 dns server (DNS server group view)

Use ipv6 dns server to add an IPv6 DNS server to the DNS server group.

Use undo ipv6 dns server to remove IPv6 DNS servers from the DNS server group.

Syntax

ipv6 dns server ipv6-address [ interface-type interface-number ]

undo ipv6 dns server [ ipv6-address [ interface-type interface-number ] ]

Default

No DNS servers exist in a DNS server group.

Views

DNS server group view

Predefined user roles

network-admin

Parameters

ipv6-address : Specifies the IPv6 address of a DNS server.

Usage guidelines

The device sends a DNS query to DNS servers of the DNS server group in an order that is the same as the one displayed in the display this command output for the group.

A DNS server group supports a maximum of six IPv6 DNS server addresses.

If you do not specify the ipv6-address argument, the undo ipv6 dns server command deletes all IPv6 addresses in the DNS server group.

Examples

# Add DNS server 2000::1 to DNS server group 1.

<Sysname> system-view

[Sysname] dns server-group 1

[Sysname-server-group-1] ipv6 dns server 2000::1

ipv6 dns spoofing

Use ipv6 dns spoofing to enable DNS spoofing and specify the IPv6 address to spoof DNS requests.

Use undo ipv6 dns spoofing to disable DNS spoofing.

Syntax

ipv6 dns spoofing ipv6-address [ vpn-instance vpn-instance-name ]

undo ipv6 dns spoofing ipv6-address [ vpn-instance vpn-instance-name ]

Default

DNS spoofing is disabled.

Views

System view

Predefined user roles

network-admin

Parameters

ipv6-address: Specifies the IPv6 address used to spoof DNS requests.

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. To enable DNS spoofing for the public network, do not specify this option.

Usage guidelines

Use the ipv6 dns spoofing command together with the dns proxy enable command.

DNS spoofing functions when the DNS proxy does not know the DNS server address or cannot reach the DNS server. It enables the DNS proxy to spoof DNS queries of type AAAA by responding with the specified IPv6 address.

The system allows only one replied IPv6 address for the public network or each VPN instance. If you execute this command multiple times, the most recent configuration takes effect. You can configure DNS spoofing for both public network and VPN instances.

Examples

# Enable DNS spoofing for the public network and specify IPv6 address 2001::1 for spoofing DNS requests.

<Sysname> system-view

[Sysname] dns proxy enable

[Sysname] ipv6 dns spoofing 2001::1

Related commands

dns proxy enable

ipv6 host

Use ipv6 host to create a host name-to-IPv6 address mapping.

Use undo ipv6 host to remove a host name-to-IPv6 address mapping.

Syntax

ipv6 host host-name ipv6-address [ vpn-instance vpn-instance-name ]

undo ipv6 host host-name ipv6-address [ vpn-instance vpn-instance-name ]

Default

No host name-to-IPv6 address mappings exist.

Views

System view

Predefined user roles

network-admin

Parameters

· The host name string is separated by dots (.). Each separated part includes up to 63 characters.

· The host name cannot start or end with a dot (.).

· The host name cannot contain two consecutive dots (..).

ipv6-address: Specifies the IPv6 address of the host.

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. To create a host name-to-IPv6 address mapping for the public network, do not specify this option.

Usage guidelines

The system allows a maximum of 1024 host name-to-IPv6 address mappings for the public network or each VPN instance. You can configure host name-to-IPv6 address mappings for both public network and VPN instances.

For the public network or a VPN instance, each host name maps to only one IPv6 address. If you execute this command multiple times, the most recent configuration takes effect.

Do not use the ping ipv6 command parameter -a, -c, -i, -m, -q, -s, -t, -tc, -v, or -vpn-instance as the host name. For more information about the ping ipv6 command parameters, see Network Management and Monitoring Command Reference.

Examples

# Map IPv6 address 2001::1 to host name aaa for the public network.

<Sysname> system-view

[Sysname] ipv6 host aaa 2001::1

Related commands

ip host

reset dns host

Use reset dns host to clear dynamic DNS entries.

Syntax

reset dns host [ cache ] [ ip | ipv6 ] [ vpn-instance vpn-instance-name ]

Views

User view

Predefined user roles

network-admin

Parameters

cache: Clears domain name-to-IP address mappings in DNS cache.

ip: Specifies type A queries. A type A query resolves a domain name to the mapped IPv4 address.

ipv6: Specifies type AAAA queries. A type AAAA query resolves a domain name to the mapped IPv6 address.

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. If you do not specify a VPN instance, this command clears dynamic DNS entries for the public network.

Usage guidelines

If you do not specify the cache keyword, this command clears the following dynamic DNS entries:

· Dynamic DNS entries on the DNS client.

· Dynamic DNS entries on the device enabled with DNS transparent proxy or DNS snooping.

If you do not specify the ip or ipv6 keyword, the reset dns host command clears dynamic DNS entries of all query types.

Examples

# Clear dynamic DNS entries of all query types for the public network.

<Sysname> reset dns host

Related commands

display dns host

DDNS commands

ddns apply policy

Use ddns apply policy to apply a DDNS policy to an interface and enable DDNS update. DDNS updates the mapping between the FQDN and the primary IP address of the interface.

Use undo ddns apply policy to remove the application of a DDNS policy from an interface and to stop DDNS update.

Syntax

ddns apply policy policy-name [ fqdn domain-name ]

undo ddns apply policy policy-name

Default

No DDNS policy and FQDN are specified on the interface, and DDNS update is disabled.

Views

Interface view

Predefined user roles

network-admin

Parameters

policy-name: Specifies a DDNS policy by its name, a case-insensitive string of 1 to 32 characters.

fqdn domain-name: Specifies the FQDN to replace <h> in the URL for DDNS update. The domain-name argument specifies a case-insensitive string of 1 to 253 characters. It can include letters, digits, hyphens (-), underscores (_), and dots (.).

Usage guidelines

You can apply a maximum of four DDNS policies to an interface.

If you execute this command multiple times with the same DDNS policy name but different FQDNs, both of the following occur:

· The most recent configuration takes effect.

· The device initiates a DDNS update request immediately.

Examples

# Apply DDNS policy steven_policy to GigabitEthernet 1/0/1 to update the domain name-to-IP address mapping for FQDN www.example.com and enable DDNS update.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] ddns apply policy steven_policy fqdn www.example.com

Related commands

ddns policy

display ddns policy

ddns dscp

Use ddns dscp to set the DSCP value for outgoing DDNS packets.

Use undo ddns dscp to restore the default.

Syntax

ddns dscp dscp-value

undo ddns dscp

Default

The DSCP value for outgoing DDNS packets is 0.

Views

System view

Predefined user roles

network-admin

Parameters

dscp-value: Specifies the DSCP value in the range of 0 to 63.

Usage guidelines

The DSCP value of a packet specifies the priority level of the packet and affects the transmission priority of the packet. A bigger DSCP value represents a higher priority.

Examples

# Set the DSCP value to 30 for outgoing DDNS packets.

<Sysname> system-view

[Sysname] ddns dscp 30

ddns policy

Use ddns policy to create a DDNS policy and enter its view, or enter the view of an existing DDNS policy.

Use undo ddns policy to delete a DDNS policy.

Syntax

ddns policy policy-name

undo ddns policy policy-name

Default

No DDNS policies exist.

Views

System view

Predefined user roles

network-admin

Parameters

policy-name: Specifies the DDNS policy name, a case-insensitive string of 1 to 32 characters.

Usage guidelines

You can create a maximum of 16 DDNS policies on the device.

Examples

# Create a DDNS policy named steven_policy and enter its view.

<Sysname> system-view

[Sysname] ddns policy steven_policy

Related commands

ddns apply policy

display ddns policy

Use display ddns policy to display information about DDNS policies.

Syntax

display ddns policy [ policy-name ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

policy-name: Specifies a DDNS policy by its name, a case-insensitive string of 1 to 32 characters. If you do not specify a DDNS policy, this command displays information about all DDNS policies.

Examples

# Display information about DDNS policy steven_policy.

<Sysname> display ddns policy steven_policy

DDNS policy: steven_policy

URL : http://members.3322.org/dyndns/update?

system=dyndns&hostname=<h>&myip=<a>

Username : steven

Password : ******

Method : GET

SSL client policy:

Interval : 1 days 0 hours 1 minutes

# Display information about all DDNS policies.

<Sysname> display ddns policy

DDNS policy: steven_policy

URL : http://members.3322.org/dyndns/update?system=

dyndns&hostname=<h>&myip=<a>

Username : steven

Password : ******

Method : GET

SSL client policy:

Interval : 0 days 0 hours 30 minutes

DDNS policy: tom-policy

URL : http://members.3322.org/dyndns/update?system=

dyndns&hostname=<h>&myip=<a>

Username :

Password :

Method : GET

SSL client policy:

Interval : 0 days 0 hours 15 minutes

DDNS policy: u-policy

URL : oray://phddns60.oray.net

Username : username

Password :

Method : -

SSL client policy:

Interval : 0 days 0 hours 15 minutes

Table 10 Command output

Field	Description
DDNS policy	DDNS policy name.
URL	URL address for a DDNS update request. This field is empty if no URL address is configured.
Username	Username for logging in to the DDNS server. This field is empty if no username is configured.
Password	Password for logging in to the DDNS server. This field is empty if no password is configured and displays ****** if a password is configured.
Method	Parameter transmission method used to send HTTP/HTTPS-based DDNS update requests. Method types include GET and POST.
SSL client policy	Name of the associated SSL client policy. This field is empty if no SSL client policy is associated.
Interval	Interval for sending DDNS update requests.

Related commands

ddns policy

interval

Use interval to set the interval for sending DDNS update requests.

Use undo interval to restore the default.

Syntax

interval days [ hours [ minutes ] ]

undo interval

Default

The DDNS update request interval is one hour.

Views

DDNS policy view

Predefined user roles

network-admin

Parameters

days: Days in the range of 0 to 365.

hours: Hours in the range of 0 to 23.

minutes: Minutes in the range of 0 to 59.

Usage guidelines

Whether the interval is reached or not, a DDNS update request is initiated immediately if either of the following conditions occurs:

· The primary IP address of the interface changes.

· The link state of the interface changes from down to up.

If you set the interval to 0, the device does not periodically initiate DDNS update requests. However, it initiates a DDNS update request in either of the following situations:

· The primary IP address of the interface changes.

· The link state of the interface changes from down to up.

If you execute this command multiple times, the most recent configuration takes effect. If you change the interval for an applied DDNS policy, the device immediately initiates a DDNS update request and sets the interval as the update interval.

Examples

# Set the interval to 1 day and 1 minute for sending DDNS update requests for DDNS policy steven_policy.

<Sysname> system-view

[Sysname] ddns policy steven_policy

[Sysname-ddns-policy-steven_policy] interval 1 0 1

Related commands

ddns policy

display ddns policy

method

Use method to specify the parameter transmission method for sending DDNS update requests to HTTP/HTTPS-based DDNS servers.

Use undo method to restore the default.

Syntax

method { http-get | http-post }

undo method

Default

The method http-get applies.

Views

DDNS policy view

Predefined user roles

network-admin

Parameters

http-get: Uses the get operation.

http-post: Uses the post operation.

Usage guidelines

This command applies to DDNS updates in HTTP/HTTPS. If the DDNS server uses HTTP or HTTPS service, choose a parameter transmission method compatible with the DDNS server. For example, a DHS server supports the http-post method.

If the DDNS policy has been applied to an interface, a DDNS update is sent immediately after the parameter transmission is changed.

Examples

# Specify the parameter transmission method as http-post for DDNS update requests for DDNS policy steven_policy.

<Sysname> system-view

[Sysname] ddns policy steven_policy

[Sysname-ddns-policy-steven_policy] method http-post

Related commands

ddns policy

display ddns policy

password

Use password to specify the password for logging in to the DDNS server.

Use undo password to restore the default.

Syntax

password { cipher | simple } string

undo password

Default

No password is specified for logging in to the DDNS server.

Views

DDNS policy view

Predefined user roles

network-admin

Parameters

cipher: Specifies a password in encrypted form.

simple: Specifies a password in plaintext form. For security purposes, the password specified in plaintext form will be stored in encrypted form.

string: Specifies the password. Its plaintext form is a case-sensitive string of 1 to 32 characters. Its encrypted form is a case-sensitive string of 1 to 73 characters.

Examples

# In DDNS policy steven_policy, specify nevets as the password for logging in to the DDNS server.

<Sysname> system-view

[Sysname] ddns policy steven_policy

[Sysname-ddns-policy-steven_policy] password simple nevets

Related commands

ddns policy

display ddns policy

url

username

ssl-client-policy

Use ssl-client-policy to associate an SSL client policy with a DDNS policy.

Use undo ssl-client-policy to restore the default.

Syntax

ssl-client-policy policy-name

undo ssl-client-policy

Default

No SSL client policy is associated with a DDNS policy.

Views

DDNS policy view

Predefined user roles

network-admin

Parameters

policy-name: Specifies a SSL client policy by its name, a case-insensitive string of 1 to 31 characters.

Usage guidelines

The SSL client policy is effective only for HTTPS-based DDNS update requests.

If you execute this command multiple times with different SSL client policies, the most recent configuration takes effect.

Examples

# Associate SSL client policy ssl_policy with DDNS policy steven_policy.

<Sysname> system-view

[Sysname] ddns policy steven_policy

[Sysname-ddns-policy-steven_policy] ssl-client-policy ssl_policy

Related commands

ddns policy

display ddns policy

ssl-client-policy (Security Command Reference)

url

Use url to specify the URL address for DDNS update requests.

Use undo url to restore the default.

Syntax

url request-url

undo url

Default

No URL address is specified for DDNS update requests.

Views

DDNS policy view

Predefined user roles

network-admin

Parameters

request-url: Specifies the URL address, a case-sensitive string of 1 to 240 characters.

Usage guidelines

The URL addresses configured for update requests vary by DDNS server. Common DDNS server URL address formats are shown in Table 11.

Table 11 Common URL addresses for DDNS update request

DDNS server	URL addresses for DDNS update requests
www.3322.org	http://members.3322.org/dyndns/update?system=dyndns&hostname=<h>&myip=<a>
DYNDNS	http://members.dyndns.org/nic/update?system=dyndns&hostname=<h>&myip=<a>
DYNS	http://www.dyns.cx/postscript.php?host=<h>&ip=<a>
ZONEEDIT	http://dynamic.zoneedit.com/auth/dynamic.html?host=<h>&dnsto=<a>
TZO	http://cgi.tzo.com/webclient/signedon.html?TZOName=<h>IPAddress=<a>
EASYDNS	http://members.easydns.com/dyn/ez-ipupdate.php?action=edit&myip=<a>&host_id=<h>
HEIPV6TB	http://dyn.dns.he.net/nic/update?hostname=<h>&myip=<a>
CHANGE-IP	http://nic.changeip.com/nic/update?hostname=<h>&offline=1
NO-IP	http://dynupdate.no-ip.com/nic/update?hostname=<h>&myip=<a>
DHS	http://members.dhs.org/nic/hosts?domain=dyn.dhs.org&hostname=<h>&hostscmd=edit&hostscmdstage=2&type=1&ip=<a>
HP	https://server-name/nic/update?group=group-name&myip=<a>
ODS	ods://update.ods.org
GNUDIP	gnudip://server-name
PeanutHull	· oray://phddns60.oray.net · oray://phservice2.oray.net

The URL address cannot contain the username or password. To configure the username and password, use the username command and the password command.

HP and GNUDIP are common DDNS update protocols. The server-name parameter is the domain name or IP address of the service provider's server using one of the update protocols.

The URL address for an update request can start with:

· http://—The HTTP-based DDNS server.

· https://—The HTTPS-based DDNS server.

· ods://—The TCP-based ODS server.

· gnudip://—The TCP-based GNUDIP server.

· oray://—The TCP-based DDNS server.

The domain names of DDNS servers are members.3322.org and phddns60.oray.net. The domain names of PeanutHull DDNS servers can be phddns60.oray.net and phservice2.oray.net. The domain name phservice2.oray.net maps to the public IP address of the old version PeanutHull DDNS server, which is not maintained any more. You need to try several times upon failures to connect to the server. As a best practice, register a new account and a domain name on the PeanutHull DDNS of a new version. Determine the domain name in the URL according to the actual situation.

The port number in the URL address is optional. If you do not specify a port number, the default port number is used. HTTP uses port 80, HTTPS uses port 443, and the PeanutHull server uses port 6060.

The system automatically performs the following tasks:

· Fills <h> with the FQDN that is specified when the DDNS policy is applied to an interface.

· Fills <a> with the primary IP address of the interface to which the DDNS policy is applied.

You can also manually specify an FQDN and an IP address in <h> and <a>, respectively. In this case, the FQDN that is specified when the DDNS policy is applied to an interface will not take effect. As a best practice, do not manually change the <h> and <a> because your configuration might be incorrect.

You cannot specify an FQDN and IP address in the URL address for contacting the PeanutHull server. Alternatively, you can specify an FQDN when applying the DDNS policy to an interface. The system automatically uses the primary IP address of the interface to which the DDNS policy is applied as the IP address for DDNS update.

To avoid misinterpretation, do not include colons (:), at signs (@), and question marks (?) in your login username or password, even if you can do so.

If you execute this command multiple times, the most recent configuration takes effect.

Examples

# Specify the URL address for DDNS update requests for DDNS policy steven_policy. The device contacts www.3322.org for DDNS update.

<Sysname> system-view

[Sysname] ddns policy steven_policy

[Sysname-ddns-policy-steven_policy] url http:// members.3322.org/dyndns/update?system=dyndns&hostname=<h>&myip=<a>

Related commands

ddns policy

display ddns policy

password

username

Use username to specify the username for logging in to the DDNS server.

Use undo username to restore the default.

Syntax

username username

undo username

Default

No username is specified for logging in to the DDNS server.

Views

DDNS policy view

Predefined user roles

network-admin

Parameters

username: Specifies the username, a case-sensitive string of 1 to 32 characters.

Examples

# In DDNS policy steven_policy, specify steven as the username for logging in to the DDNS server.

<Sysname> system-view

[Sysname] ddns policy steven_policy

[Sysname-ddns-policy-steven_policy] username steven

Related commands

ddns policy

display ddns policy

password

url

07-Layer 3—IP Services Command Reference

description

display ipv6 dns server

dns proxy enable

dns server

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