Example for Configuring Dynamic DNS Client

This section describes how to configure dynamic DNS.

Networking Requirements

As shown in Figure 1, Device A serves as the DNS client. With the help of the DNS server, Device A can use the domain name "huawei.com" to access the host with IP address 10.2.1.3/16.

Figure 1 Networking diagram for dynamic DNS

Interfaces 1 through 2in this example are GE 0/1/0, GE 0/1/1 respectively.

Configuration Roadmap

The configuration roadmap is as follows:

Enable dynamic DNS.
Configure the IP address of the DNS server.
Configure a domain name suffix.

Data Preparation

To complete the configuration, you need the following data:

Domain names of Device B and Device C
IP address of the DNS server
Domain name suffixes

Procedure

Configure Device A.
# Configure dynamic DNS entries.
```
<HUAWEI> system-view
[~HUAWEI]sysname DeviceA
[*HUAWEI]commit
```
# Enable dynamic DNS.
```
[~DeviceA] dns resolve
```
# Configure the IP address of the DNS server.
```
[*DeviceA] dns server 10.3.1.2
```
# Configure a domain name suffix "net".
```
[*DeviceA] dns domain net
```
# Configure a domain name suffix "com".
```
[*DeviceA] dns domain com
[*DeviceA] commit
[~DeviceA] quit
```
To implement domain name resolution, you must configure a route between Device A and the DNS server for them to communicate. For details about how to configure a route, see NetEngine 8000 FRouter Configuration Guide - IP Routing.

Verify the configuration.

# Run the ping huawei command on Device A. The host with domain name "huawei.com" can be pinged. The destination IP address for the ping operation is 10.2.1.3.

<DeviceA> ping huawei.com
  PING huawei.com (10.2.1.3): 56  data bytes, press CTRL_C to break
    Reply from 10.2.1.3: bytes=56 Sequence=1 ttl=126 time=6 ms
    Reply from 10.2.1.3: bytes=56 Sequence=2 ttl=126 time=4 ms
    Reply from 10.2.1.3: bytes=56 Sequence=3 ttl=126 time=4 ms
    Reply from 10.2.1.3: bytes=56 Sequence=4 ttl=126 time=4 ms
    Reply from 10.2.1.3: bytes=56 Sequence=5 ttl=126 time=4 ms
  --- huawei.com ping statistics ---
    5 packet(s) transmitted
    5 packet(s) received
    0.00% packet loss
    round-trip min/avg/max = 4/4/6 ms

# Run the display dns dynamic-host command on Device A. Dynamic DNS entry information stored in the cache is displayed.

<DeviceA> display dns dynamic-host
No  Domain Name           IpAddress            TTL       Alias
1   huawei.com            10.2.1.3             3579

TTL indicates how long a DNS entry can exist, in seconds.

Configuration Files

Configuration file of Device A

#
 sysname DeviceA
#
 dns resolve
 dns server 10.3.1.2
 dns domain net
 dns domain com
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 1.1.1.2 255.255.0.0
#
rip 1
 network 1.0.0.0
#
return

Configuration file of Device B

#
 sysname DeviceB
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 2.1.1.1 255.255.0.0
#
interface GigabitEthernet0/1/1
 undo shutdown
 ip address 1.1.1.1 255.255.0.0
#
interface LoopBack0
 ip address 4.1.1.1 255.255.255.255
#
rip 1
 network 2.0.0.0
network 1.0.0.0
 network 4.0.0.0
#
return

Configuration file of Device C

#
 sysname DeviceC
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 2.1.1.2 255.255.0.0
#
interface GigabitEthernet0/1/1
 undo shutdown
 ip address 3.1.1.1 255.255.0.0
#
interface LoopBack0
 ip address 4.1.1.2 255.255.255.255
#
rip 1
 network 2.0.0.0
 network 3.0.0.0
network 4.0.0.0
#
return