R3303-HP HSR6800 Routers Layer 3 - IP Services Configuration Guide

# Enable dynamic domain name resolution.

<Sysname> system-view

[Sysname] dns resolve

# Specify the DNS server 2.1.1.2.

[Sysname] dns server 2.1.1.2

# Configure com as the name suffix.

[Sysname] dns domain com

Verifying the configuration

# Use the ping host command on the device to verify that the communication between the device and the

host is normal and that the corresponding destination IP address is 3.1.1.1.

[Sysname] ping host

Trying DNS resolve, press CTRL_C to break

Trying DNS server (2.1.1.2)

PING host.com (3.1.1.1):

56 data bytes, press CTRL_C to break

Reply from 3.1.1.1: bytes=56 Sequence=1 ttl=126 time=3 ms

Reply from 3.1.1.1: bytes=56 Sequence=2 ttl=126 time=1 ms

Reply from 3.1.1.1: bytes=56 Sequence=3 ttl=126 time=1 ms

Reply from 3.1.1.1: bytes=56 Sequence=4 ttl=126 time=1 ms

Reply from 3.1.1.1: bytes=56 Sequence=5 ttl=126 time=1 ms

--- host.com ping statistics ---

5 packet(s) transmitted

5 packet(s) received

0.00% packet loss

round-trip min/avg/max = 1/1/3 ms

DNS proxy configuration example

Network requirements

When the IP address of the DNS server changes, you must configure the new IP address of the DNS

server on each device on the LAN. To simplify network management, you can use the DNS proxy

function.

As shown in Figure 43:

• S

pecify Router A as the DNS server of Router B (the DNS client). Router A acts as a DNS proxy. The

IP address of the real DNS server is 4.1.1.1.

• Configure the IP address of the DNS proxy on Router B. DNS requests of Router B are forwarded to

the real DNS server through the DNS proxy.