3Com WX3000 operation manual Displaying and Maintaining DNS, Troubleshooting DNS Configuration

Displaying and Maintaining DNS

To do…	Use the command…	Remarks
Display static DNS database	display ip host
Display the DNS server	display dns server [ dynamic ]
information
		Available in any view
Display the DNS suffixes	display dns domain [ dynamic ]
Display the information in the	display dns dynamic-host
dynamic domain name cache
Display the DNS resolution result	nslookup type { ptr ip-addressa	Available in any view
	domain-name }
Clear the information in the	reset dns dynamic-host	Available in user view
dynamic domain name cache

Troubleshooting DNS Configuration

Symptom

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

Solution

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Use the display dns dynamic-hostcommand to check 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 exists in the cache but the IP address is incorrect, check that the DNS client has the correct IP address of the DNS server.

Check that the mapping between the domain name and IP address is correct on the DNS server.

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