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

Peter van Dijk <peter.van.dijk@powerdns.com> Fri, 31 July 2020 20:29 UTC

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From: Peter van Dijk <peter.van.dijk@powerdns.com>
To: "dns-privacy@ietf.org" <dns-privacy@ietf.org>
Date: Fri, 31 Jul 2020 22:29:37 +0200
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Subject: Re: [dns-privacy] Registry framework for draft-ietf-dprive-early-data
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On Thu, 2020-07-30 at 02:58 +0100, Tony Finch wrote:
> 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.

NOTIMP tells the client 'I do not support the QUERY opcode'. That is
not a message you want to send out, unless you want people to just stop
querying you.

(PowerDNS has picked REFUSED as the response to RRSIG queries).

Kind regards,
-- 
Peter van Dijk
PowerDNS.COM BV - https://www.powerdns.com/

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