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# Specify the DNS server 2.1.1.2.

[SwitchB] dns server 2.1.1.2

4) Configuration verification

# Execute the ping host.com command on Switch B to verify that the communication between the

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

[SwitchB] ping host.com

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

Troubleshooting DNS Configuration

Symptom

After enabling the dynamic domain name resolution, the user cannot get the correct IP address.

Solution

z Use the display dns dynamic-host command to verify that the specified domain name is in the

cache.

z If the specified domain name does not exist, check that dynamic domain name resolution is

enabled and the DNS client can communicate with the DNS server.

z If the specified domain name is in the cache, but the IP address is incorrect, check that the DNS

client has the correct IP address of the DNS server.

z Verify the mapping between the domain name and IP address is correct on the DNS server.

H3C S5120-EI Series User Manual

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