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Re: [dns-privacy] Registry framework for draft-ietf-dprive-early-data

Tony Finch <dot@dotat.at> Thu, 30 July 2020 01:58 UTC

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Date: Thu, 30 Jul 2020 02:58:29 +0100
From: Tony Finch <dot@dotat.at>
To: Ilari Liusvaara <ilariliusvaara@welho.com>
cc: alessandro@ghedini.me, "dns-privacy@ietf.org" <dns-privacy@ietf.org>
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References: <d812edb8-b3b3-d1db-13e8-8da9a945516d@innovationslab.net> <20200722192652.GA486629@LK-Perkele-VII> <20200723115702.GA5505@wakko.flat11.house> <20200728133627.GA579947@LK-Perkele-VII>
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Subject: Re: [dns-privacy] Registry framework for draft-ietf-dprive-early-data
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Ilari Liusvaara <ilariliusvaara@welho.com> wrote:
>
> Then there is RRSIG, which seems bit alarming. While direct queries
> should not do anything special, I noticed two troublesome properties:
>
> 1) The answers can be pretty large (amplification hazard with UDP).
> 2) The queries can be really slow compared to other types.

Yes. From an implementation perspective, RRSIG queries work in a very
similar way to ANY queries. They have the advantage that no-one is likely
to think an RRSIG query is useful, so it's reasonable to NOTIMP them.
If QTYPE=ANY is forbidden for early data then QTYPE=RRSIG should be too.

Tony.
-- 
f.anthony.n.finch  <dot@dotat.at>  http://dotat.at/
Plymouth: Variable 4 or less, becoming east 3 to 5 for a time. Smooth or
slight becoming slight or moderate. Fair. Good.

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