Re: [DNSOP] Second Working Group Last Call for draft-ietf-dnsop-extended-error

Vladimír Čunát <vladimir.cunat@nic.cz> Mon, 18 November 2019 10:58 UTC

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Cc: Viktor Dukhovni <ietf-dane@dukhovni.org>
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Date: Mon, 18 Nov 2019 11:59:13 +0100
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dnsop/O9RnkwJY86rF7-HxpbM0LS8iysA>
Subject: Re: [DNSOP] Second Working Group Last Call for draft-ietf-dnsop-extended-error
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On 11/14/19 12:05 AM, Viktor Dukhovni wrote:
> It'd be a shame (though admittedly not frequent) to have a resolver
> retry over TCP just to get the same answer with additional information
> it does not need and perhaps does not even understand.

EDE codes themselves take very little space, so truncating just the
textual messages might be a good middle-ground.... but I certainly
haven't tried thinking of all implications on EDE truncation yet. 
Communicating these through bit(s) in EDE or EDNS flags might be nice,
and clients might even use them to set their preference.

Still, ATM I can't clearly see whether such TC details would be useful
in practice.  I think we're fortunate that most use cases for EDE are
failures... so the answer will probably be tiny.

--Vladimir