Re: [Spasm] CAA erratum 4515

"Salz, Rich" <rsalz@akamai.com> Wed, 15 March 2017 14:57 UTC

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From: "Salz, Rich" <rsalz@akamai.com>
To: Ryan Sleevi <ryan-ietf@sleevi.com>, Jacob Hoffman-Andrews <jsha@eff.org>
CC: Patrick Donahue <pat@cloudflare.com>, Gervase Markham <gerv@mozilla.org>, Peter Bowen <pzb@amzn.com>, "spasm@ietf.org" <spasm@ietf.org>, Rob Stradling <rob.stradling@comodo.com>, Phillip Hallam-Baker <phill@hallambaker.com>
Thread-Topic: [Spasm] CAA erratum 4515
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Date: Wed, 15 Mar 2017 14:57:36 +0000
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Subject: Re: [Spasm] CAA erratum 4515
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> I argue that this is less intuitive and more difficult than in the tree-climbing world. 

Did you mean "than in the *non* tree-climbing world?

> and apologies for my own ignorance here, as I couldn't find where the exclusivity was stated that ONLY a CNAME record may exist - is a pretty compelling argument against the tree climbing.

Sec 10.1 of RFC 2181, which clarifies 3.6.2 of RFC 1034 says (excerpt):
   An alias name (label of a CNAME record) may,
   if DNSSEC is in use, have SIG, NXT, and KEY RRs, but may have no
   other data.

Hope this helps.