Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 
Community Member

ip domain-list behaviour


in the router 3662 IOS 12.2(1) config for dns looks as follows:


ip domain-list

ip domain-list

ip name-server


I do not specify ip domain-name option.

When configured like this IOS NEVER resolves any name if it contains domain in it, in other words if there is at least one dot "." in the name. It can only resolve if only hostname is specified, i.e. no dots, consequently only hostnames in domains and in this example.

Why? such and implementation substantialy differs from BIND 4.9 implementation, for instance, which is mostly used. I have done thousands of traces with debug turned on on my DNS server to figure out how IOS constructs names using suffixes when sending a request and I could not figure out the logic behind it. There are cases when IOS does not send a request AT ALL!!! even if i request a name of valid and existing host.

Please, explain if anyone had the same problems.




Re: ip domain-list behaviour

Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center ( or speak with a TAC engineer. You can open a TAC case online at

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.

CreatePlease to create content