Re: [DNSOP] Tell me about tree walks

Stephane Bortzmeyer <bortzmeyer@nic.fr> Sun, 22 November 2020 07:41 UTC

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Date: Sun, 22 Nov 2020 08:41:25 +0100
From: Stephane Bortzmeyer <bortzmeyer@nic.fr>
To: Tony Finch <dot@dotat.at>
Cc: John Levine <johnl@taugh.com>, dnsop@ietf.org
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Subject: Re: [DNSOP] Tell me about tree walks
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On Wed, Nov 11, 2020 at 09:39:38PM +0000,
 Tony Finch <dot@dotat.at> wrote 
 a message of 34 lines which said:

> Well, the other Very Prominent example is CAA records, which also
> involve walking up the tree to discover policy. It would be nice if
> things like CAA and DMARC could agree with each other about how they
> discover domain-wide policies.

IMHO, the CAA algorithm is bad because it crosses administrative
boundaries. RFC 8659 at least excludes the root but it still allows,
for instance, AFNIC to put a CAA record in .fr which will apply to all
.fr domains which do not have an explicit CAA. It seems bad.