DNS proxy configuration example

As shown in Figure 42, configure Device A as the DNS proxy to forward DNS packets between the DNS client (Device B) and the DNS server at 4.1.1.1.

Before performing the following configuration, make sure that:

• Device A, the DNS server, and the host can reach each other.

• The IP addresses of the interfaces are configured as shown in Figure 42.

1. Configure the DNS server:

   The configuration might vary by DNS server. When a PC running Windows Server 2008 R2 acts as the DNS server, see "Dynamic domain name resolution configuration example" for configuration information.

2. Configure the DNS proxy:

   # Specify the DNS server 4.1.1.1.

   <DeviceA> system-view
   [DeviceA] dns server 4.1.1.1
   

   # Enable DNS proxy.

   [DeviceA] dns proxy enable
   

3. Configure the DNS client:

   <DeviceB> system-view
   

   # Specify the DNS server 2.1.1.2.

   [DeviceB] dns server 2.1.1.2
   

# Verify that DNS proxy on Device A functions.

[DeviceB] ping host.com
Ping host.com (3.1.1.1): 56 data bytes, press CTRL_C to break
56 bytes from 3.1.1.1: icmp_seq=0 ttl=255 time=1.000 ms
56 bytes from 3.1.1.1: icmp_seq=1 ttl=255 time=1.000 ms
56 bytes from 3.1.1.1: icmp_seq=2 ttl=255 time=1.000 ms
56 bytes from 3.1.1.1: icmp_seq=3 ttl=255 time=1.000 ms
56 bytes from 3.1.1.1: icmp_seq=4 ttl=255 time=2.000 ms

--- Ping statistics for host.com ---
5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss
round-trip min/avg/max/std-dev = 1.000/1.200/2.000/0.400 ms