3Com Switch 4800G 24-Port - Troubleshooting DNS Configuration

980 CHAPTER 78: DNS CONFIGURATION
[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
■ Use the display dns dynamic-host command to verify that the specified
domain name is in the cache.
■ 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.
■ 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.
■ Verify the mapping between the domain name and IP address is correct on the
DNS server.