Weird DNS Issue

Unanswered Question
Aug 26th, 2010
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Hey Everyone.

I have a new install of a Cisco 871. The install started though SDM, But because it sucks. i stopped using it

THe rest of the config was done through CLI.  I think I remember seeing this problem before but i dont remember how i fixed it. So everything is working fine, except sometimes DNS isnt resolving correctly, or the page looks messed up with X's through images etc.. I remember fixing this before with a PIX because there was a DNS max size thing or something, and i could have sworn i did this with an 871 before too.. Eitherway, its driving me nuts because it only happens sometimes..

Any ideas??



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Phillip Remaker Mon, 08/30/2010 - 12:16
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There was a PIX-specific issue with EDNS responses a long time ago, but that problem never existed in IOS as far as I know.

If you have DNS inspection turned on and are enforcing the old 512 byte limit you may be dropping legitimate DNS traffic.

Are you sure it is a DNS failure?


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