4000 Router Series Layer 3 - IP Services Command Reference

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dns server

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

Use undo dns server to remove the specified IPv4 address of a DNS server. If no IPv4 address is specified,

the undo dns server command removes all DNS server IPv4 addresses on the public network or the

specified VPN.

Syntax

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

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

Default

No DNS server is specified.

Views

System view

Predefined user roles

network-admin

Parameters

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

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string

of 1 to 31 characters. To specify an IPv4 address on the public network, do not use this option.

Usage guidelines

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

You can specify DNS server IPv4 addresses for the public network and up to 1024 VPNs, and specify a

maximum of six IPv4 addresses for the public network or each VPN.

Examples

# Specify the IPv4 address of a DNS server as 172.16.1.1.

<Sysname> system-view

[Sysname] dns server 172.16.1.1

Related commands

display dns server

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 ]