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Re: [dnsext] BADVER/FORMERR

Ray Bellis <Ray.Bellis@nominet.org.uk> Sat, 12 November 2011 14:12 UTC

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From: Ray Bellis <Ray.Bellis@nominet.org.uk>
To: Mark Andrews <marka@isc.org>
Thread-Topic: [dnsext] BADVER/FORMERR
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Date: Sat, 12 Nov 2011 14:11:54 +0000
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Subject: Re: [dnsext] BADVER/FORMERR
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On 12 Nov 2011, at 16:49, Mark Andrews wrote:
> 
> EDNS is RFC 2671.

Yes, 2308 was a mistake.  I did of course mean RFC 2671.

> If you don't support the EDNS version in the
> request you must send back BADVER.  At that point trying to process
> the question section, whatever it is, is moot as the RCODE has
> already been set.

Again, I ask, where is this defined?

I can't see anything in _2671_ that says that processing of the EDNS version number takes priority over any other input checking that might be performed by a server.

As far as I can see, the only pertinent text in 2671, and the (expired) 2671bis draft is this:

"If a responder does not implement the VERSION level of the request, then it answers with RCODE=BADVERS"
which doesn't even have a 2119-level compliance requirement word in it.

>> Just out of interest, are there any _existing_ legitimate circumstances where
>> QDCOUNT != 1 ?
> 
> Seeing if a server is alive.
> Getting the EDNS UDP size prior to sending a UPDATE. 
> Getting the EDNS version prior to anything.

> If I set qcount=2 with ./in/a and ./in/aaaa and edns=50 the correct
> rcode for a edns=0 server is BADVER.

Why not something else?  Because *BIND* doesn't do it that way?

Ray

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