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Re: [dnsext] draft-vixie-dnsext-resimprove - NXDOMAIN for emptynon-terminals

"George Barwood" <george.barwood@blueyonder.co.uk> Mon, 28 March 2011 21:27 UTC

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From: George Barwood <george.barwood@blueyonder.co.uk>
To: Tony Finch <dot@dotat.at>, dnsext@ietf.org
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Date: Mon, 28 Mar 2011 22:29:20 +0100
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Subject: Re: [dnsext] draft-vixie-dnsext-resimprove - NXDOMAIN for emptynon-terminals
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----- Original Message ----- 
From: "Tony Finch" <dot@dotat.at>
To: <dnsext@ietf.org>
Sent: Monday, March 28, 2011 3:24 PM
Subject: [dnsext] draft-vixie-dnsext-resimprove - NXDOMAIN for emptynon-terminals


> Arising from the discussion at the meeting about treating a cached
> NXDOMAIN as applying to all child domains...
> 
> The main concern about this clarificationin is buggy implementations that
> give an NXDOMAIN for empty non-terminal names that have non-empty child
> domains. The examples cited were DJBDNS and in particular rbldnsd. (I
> presume there are others that we don't know about.)

Could the new interpretation be restricted to cases where there are NSEC or NSEC3 records
that show that there are no child sub-domains?

That would seem to avoid any compatibility problems.

I'd also like to see the standard updated to allow resolvers to infer NoData conditions
from NSEC/NSEC3 records ( the standard does not exactly forbid this at present, but
there is discouraging language ).

Finally, I'm happy to support the adoption of draft-vixie-dnsext-resimprove

George

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