Example: Configuring DNS proxy

As shown in Figure 50, configure Device A as the DNS proxy to forward DNS packets between the DNS client (Device B) and the DNS server at 4000::1.

	IMPORTANT: By default, interfaces on the device are disabled (in ADM or Administratively Down state). To have an interface operate, you must use the undo shutdown command to enable that interface.

Before performing the following configuration, make sure that:

• Device A, the DNS server, and the host are reachable to each other.

• The IPv6 addresses of the interfaces are configured as shown in Figure 50.

1. Configure the DNS server:

   This configuration might vary by DNS server. When a PC running Windows Server 2008 R2 acts as the DNS server, see "Example: Configuring dynamic domain name resolution" for configuration information.

2. Configure the DNS proxy:

   # Specify the DNS server 4000::1.

   <DeviceA> system-view
   [DeviceA] ipv6 dns server 4000::1
   

   # Enable DNS proxy.

   [DeviceA] dns proxy enable
   

3. Configure the DNS client:

   # Specify the DNS server 2000::2.

   <DeviceB> system-view 
   [DeviceB] ipv6 dns server 2000::2
   

# Verify that DNS proxy on Device A functions.

[DeviceB] ping host.com
Ping6(56 data bytes) 2000::1 --> 3000::1, press CTRL_C to break
56 bytes from 3000::1, icmp_seq=0 hlim=128 time=1.000 ms
56 bytes from 3000::1, icmp_seq=1 hlim=128 time=0.000 ms
56 bytes from 3000::1, icmp_seq=2 hlim=128 time=1.000 ms
56 bytes from 3000::1, icmp_seq=3 hlim=128 time=1.000 ms
56 bytes from 3000::1, icmp_seq=4 hlim=128 time=0.000 ms

--- Ping6 statistics for host.com ---
5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss
round-trip min/avg/max/std-dev = 0.000/0.600/1.000/0.490 ms