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Re: [dns-privacy] [Ext] Revised opportunistic encryption draft

Tony Finch <dot@dotat.at> Wed, 18 November 2020 22:24 UTC

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Date: Wed, 18 Nov 2020 22:24:23 +0000
From: Tony Finch <dot@dotat.at>
To: Peter van Dijk <peter.van.dijk@powerdns.com>
cc: "dprive@ietf.org" <dprive@ietf.org>
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Subject: Re: [dns-privacy] [Ext] Revised opportunistic encryption draft
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Peter van Dijk <peter.van.dijk@powerdns.com> wrote:

> > https://datatracker.ietf.org/doc/draft-ietf-dnsop-ns-revalidation/
>
> As I understand the draft, the revalidation can happen in parallel to
> the actual query the user is waiting for. Any setup/discovery of secure
> transports would have to happen before that, so I'm not sure we can say
> 'on top of delegation revalidation, TLSA lookups are basically free'.

Yes, this still needs to be thought through more carefully, and measured
in the real world. There are at least a couple of issues that worry me:

  * Exactly how bad is the extra latency?

  * How bad / avoidable are the lurking interop traps?

Likely at least two flavours of the latter: due to asking for TLSA, or
due to deeper iterative resolution into the nameserver's name's zone.

Tony.
-- 
f.anthony.n.finch  <dot@dotat.at>  http://dotat.at/
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