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Re: [lamps] CAA records on CNAMEs

Tim Wicinski <tjw.ietf@gmail.com> Sun, 17 March 2019 20:48 UTC

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From: Tim Wicinski <tjw.ietf@gmail.com>
Date: Sun, 17 Mar 2019 13:48:04 -0700
Message-ID: <CADyWQ+HeC=eOhYPiJnFkUZH8SJUVzbPHb56PBz=ima7VxmGzAA@mail.gmail.com>
To: Ilari Liusvaara <ilariliusvaara@welho.com>
Cc: SPASM <spasm@ietf.org>
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Subject: Re: [lamps] CAA records on CNAMEs
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I am no DNS expert, but I routinely see DNS records of the form

foobar.example.com CNAME cdn.example.net
email.foobar.example.com MX
email.foorbar.example.com TXT

But of course RFC8499 is the better source.

Going back to the presentations, Phillip Hallam-Baker noted that _prefix
labels don't work with DNAME.

Tim


On Sun, Mar 17, 2019 at 12:16 PM Ilari Liusvaara <ilariliusvaara@welho.com>
wrote:

> On Sun, Mar 17, 2019 at 11:49:28AM -0700, Tim Wicinski wrote:
> > We did not like using something like _caa.example.com ?
> >
> > I mean we have an RFC and an IANA registry all set up to handle the
> > underscore name
> > (well almost https://tools.ietf.org/html/draft-ietf-dnsop-attrleaf-16)
> >
> > We've been burned on CAA records for specific FQDNs which are CNAMEs.
>
> I think that was essentially one of the proposals.
>
> And IIRC, the real nasty issue was treeclimbing on CNAME target, that
> caused a lot of issues.
>
>
> -Ilari
>

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