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Re: [DNSOP] CloudFlare policy on ANY records changing

Evan Hunt <each@isc.org> Sat, 14 March 2015 20:52 UTC

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Date: Sat, 14 Mar 2015 20:52:19 +0000
From: Evan Hunt <each@isc.org>
To: Florian Weimer <fw@deneb.enyo.de>
Message-ID: <20150314205219.GA20079@isc.org>
References: <20150311150622.GA91255@isc.org> <alpine.LSU.2.00.1503111617130.23307@hermes-1.csi.cam.ac.uk> <20150311171535.GC91255@isc.org> <alpine.LSU.2.00.1503111723080.10193@hermes-1.csi.cam.ac.uk> <871tku18np.fsf@mid.deneb.enyo.de> <49DEE35910F1A6438E9805F4DEBBA30715CC32C0@038-CH1MPN1-041.038d.mgd.msft.net> <20150313003003.GB65353@isc.org> <alpine.LSU.2.00.1503131036040.10193@hermes-1.csi.cam.ac.uk> <alpine.LSU.2.00.1503131709330.10193@hermes-1.csi.cam.ac.uk> <87ioe3e3xg.fsf@mid.deneb.enyo.de>
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Cc: Tony Finch <dot@dotat.at>, dnsop <dnsop@ietf.org>
Subject: Re: [DNSOP] CloudFlare policy on ANY records changing
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On Sat, Mar 14, 2015 at 09:10:03PM +0100, Florian Weimer wrote:
> We'd have to be reasonably sure that no resolver treats is as a
> meta-type and turns the upstream response into a FORMERR upon seeing
> it in the answer section.  “NULLs are used as placeholders in some
> experimental extensions of the DNS.” is not confidence-inspiring in
> this regard.

On the other hand, it saves us the grief of allocating a code point, and
it has an intuitive name: if I saw a NULL RR in a cache dump I'd
immediately guess it was a placeholder.  Your point is well taken,
but if that hypothetical resolver behavior turns out not to commonplace,
then I say let's run with it.

-- 
Evan Hunt -- each@isc.org
Internet Systems Consortium, Inc.

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