AAAA type query invalidates A records in name server cache

Bill Owens owens at
Tue Jul 19 16:48:44 UTC 2011

On Tue, Jul 19, 2011 at 04:58:53PM +0200, mailsecurity wrote:
> All,
> anyone experiencing the same behavior?

I hope so, because that's the correct behavior. Dell's nameserver is broken:
Common Misbehavior Against DNS Queries for IPv6 Addresses - May 2005
4.2.  Return "Name Error"

   This type of server returns a response with RCODE 3 ("Name Error") to
   a query for an AAAA RR, indicating that it does not have any RRs of
   any type for the queried name.

   With this response, the stub resolver may immediately give up and
   never fall back.  Even if the resolver retries with a query for an A
   RR, the negative response for the name has been cached in the caching
   server, and the caching server will simply return the negative
   response.  As a result, the stub resolver considers this to be a
   fatal error in name resolution.

fpdns says that Dell's servers are BIND, wonder if that's accurate, and if so, how ancient a release, to have this bug?


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