Contents

Overview·· 1

Prerequisites· 1

Example: Configuring IPv4 DNS proxy· 1

Network configuration· 1

Prerequisites· 1

Procedures· 2

Configuring the DNS server 2

Configuring the AC· 2

Configuring the DNS client 2

Verifying the configuration· 2

Related documentation· 3

Overview

The following information provides an example for configuring IPv4 DNS proxy to allow users to access a host through the DNS proxy. When the DNS server address is changed, you can change the configuration only on the DNS proxy instead of on each DNS client.

Prerequisites

The following information applies to Comware 7-based access controllers. Procedures and information in the examples might be slightly different depending on the software or hardware version of the H3C access controllers.

The configuration examples were created and verified in a lab environment, and all the devices were started with the factory default configuration. When you are working on a live network, make sure you understand the potential impact of every command on your network.

The following information is provided based on the assumption that you have basic knowledge of DNS proxy.

Example: Configuring IPv4 DNS proxy

Network configuration

As shown in Figure 1, the AC acts as the DNS proxy to relay DNS packets between wireless client and the DNS server. The wireless client accesses the host with domain name host.com through the DNS proxy.

Figure 1 Network diagram

Prerequisites

Configure static routes or a dynamic routing protocol on all devices to make sure the network connections are available.

Procedures

Configuring the DNS server

On the DNS server, configure the mapping between the host's domain name host.com and IPv4 address 3.1.1.1/24. (Details not shown.)

Configuring the AC

1.     Configure basic wireless features on the AC. (Details not shown.)

2.     Specify the DNS server IP address on the AC:

a.     Click the System View tab at the bottom of the page.

b.     From the navigation pane, select Network Configuration > Network Services > DHCP/DNS.

c.     Click the IPv4 DNS tab.

d.     Specify 4.1.1.1 as the DNS server IP address.

Table 1 Specifying the DNS server address

e.     Click the Add icon .

3.     Configure the AC as the DNS proxy:

a.     On the IPv4 DNS tab, click the Advanced settings button .

b.     Enable DNS proxy.

Figure 2 Enabling DNS proxy

Configuring the DNS client

On the DNS client, specify the DNS server 2.1.1.2. (Details not shown.)

Verifying the configuration

# Execute the ping host.com command on the client and verify that the client can resolve domain name host.com into IP address 3.1.1.1.

C:\Users\aa>ping host.com                                                          

Ping host.com (3.1.1.1): 56 data bytes

56 bytes from 3.1.1.1: icmp_seq=0 ttl=128 time=0.671 ms                 

56 bytes from 3.1.1.1: icmp_seq=1 ttl=128 time=0.571 ms                 

56 bytes from 3.1.1.1: icmp_seq=2 ttl=128 time=0.373 ms                 

56 bytes from 3.1.1.1: icmp_seq=3 ttl=128 time=0.538 ms                 

56 bytes from 3.1.1.1: icmp_seq=4 ttl=128 time=0.750 ms                 

--- 3.1.1.1 ping statistics ---                        

5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss                

round-trip min/avg/max = 0.373/0.581/0.750 ms

Related documentation

H3C Access Controllers Web-Based Configuration Guide