Configuring option 82, Troubleshooting ipv4 dns configuration, Symptom – H3C Technologies H3C S12500 Series Switches User Manual
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56 bytes from 3.1.1.1: icmp_seq=2 ttl=255 time=1.000 ms
56 bytes from 3.1.1.1: icmp_seq=3 ttl=255 time=1.000 ms
56 bytes from 3.1.1.1: icmp_seq=4 ttl=255 time=2.000 ms
--- host.com ping statistics ---
5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss
round-trip min/avg/max/stddev = 1.000/1.200/2.000/0.400 ms
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Troubleshooting IPv4 DNS configuration
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Symptom
After enabling dynamic domain name resolution, the user cannot get the correct IP address.
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Solution
1.
Use the display dns host ip command to verify that the specified domain name is in the cache.
2.
If the specified domain name does not exist, check that the DNS client can communicate with the
DNS server.
3.
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.
4.
Verify that the mapping between the domain name and IP address is correct on the DNS server.