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Re: [dane] Behavior in the face of no answer?

Martin Rex <mrex@sap.com> Fri, 04 May 2012 02:42 UTC

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From: Martin Rex <mrex@sap.com>
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To: ajs@anvilwalrusden.com (Andrew Sullivan)
Date: Fri, 4 May 2012 04:42:13 +0200 (MEST)
In-Reply-To: <20120504023602.GA4683@mail.yitter.info> from "Andrew Sullivan" at May 3, 12 10:36:02 pm
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Subject: Re: [dane] Behavior in the face of no answer?
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Andrew Sullivan wrote:
> 
> Note that there remain _plenty_ of DNS servers deployed in the wild
> which, if you ask them for an RRTYPE they don't know about, spit up
> with NOTIMP, SERVFAIL, and all manner of other crappy nonsense.

You seem to be unaware that returning SERVFAIL and more so NOTIMP
to requests for unknown RRTYPES is *PERFECTLY* conformant with
rfc1034/rfc1035.  So if anything is _broken_, its clients who can
not cope with such responses (as can be seen with the IPv6 dualstack
in Windows2003).

-Martin

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