DNS question

Barry Margolin barmar at alum.mit.edu
Wed Dec 15 05:34:28 UTC 2004

In article <cpo3mt$376$1 at sf1.isc.org>, Tim Kelley <tim at it.kpt.cc> 

> A simple question ...
> Is it legal for a nameserver to ever flag a response with "AA" when it is not 
> authoritative for a zone?
> I notice windows nameservers who permit recursion will flag a response with 
> "AA" (fetched from the authoritative server) the first time the lookup is 
> done. Afterwards, when just fetching from it's cache, it does not.
> Bind never does this.

BIND used to do this.  It was changed in BIND 9.

The old behavior was that an answer was non-authoritative if it came 
from the cache.  If the server didn't have the information in its cache, 
it forwarded the query, and then simply passed the response unchanged to 
its client.  So if the response came back with the AA flag set, the 
client would see this.

Barry Margolin, barmar at alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***

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