H3C Technologies H3C S3600 Series Switches - Manual (Page 1124)

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Execute the ping host command on Switch to verify that the communication between Switch and Host
is normal and that the corresponding IP address is 3.1.1.1.
[Sysname] ping host
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=125 time=4 ms
Reply from 3.1.1.1: bytes=56 Sequence=2 ttl=125 time=4 ms
Reply from 3.1.1.1: bytes=56 Sequence=3 ttl=125 time=4 ms
Reply from 3.1.1.1: bytes=56 Sequence=4 ttl=125 time=4 ms
Reply from 3.1.1.1: bytes=56 Sequence=5 ttl=125 time=5 ms
--- host.com ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 4/4/5 ms
Troubleshooting DNS
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 check that the specified domain name is in the
cache.
z If there is no defined domain name, check that dynamic domain name resolution is enabled and the
DNS client can communicate with the DNS server.
z If the specified domain name exists in the cache but the IP address is incorrect, check that the DNS
client has the correct IP address of the DNS server.
z Check that the mapping between the domain name and IP address is correct on the DNS server.