Re: [DNSOP] review: draft-wessels-dns-zone-digest-04.txt

Richard Gibson <richard.j.gibson@oracle.com> Thu, 01 November 2018 13:08 UTC

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To: Joe Abley <jabley@hopcount.ca>, Wessels Duane <dwessels@verisign.com>
Cc: dnsop <dnsop@ietf.org>
References: <154020795105.15126.7681204022160033203@ietfa.amsl.com> <DD4AADA8-A23A-4C2C-9F0D-401CA5A51745@hopcount.ca> <509F5E08-5EDF-4A54-BB34-A76BA390F01D@verisign.com> <46FB2005-A7EF-42AD-9D78-5D121D26CB45@hopcount.ca>
From: Richard Gibson <richard.j.gibson@oracle.com>
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Date: Thu, 1 Nov 2018 09:08:09 -0400
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Subject: Re: [DNSOP] review: draft-wessels-dns-zone-digest-04.txt
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On 10/31/18 19:50, Joe Abley wrote:
>> It sounds wrong to me to say that identical instances of RRs would not be allowed in a zone.
> It's true though, right? It's not meaningful to include more than one resource record with the same (owner,type, class, TTL, RDATA) in the same RRSet, and hence also not meaningful to include such duplicates in a single zone (which is a particular set of RRSets). I don't think RFC 1034 is explicit about this, but it's surely implied. I don't know of any nameserver software that would allow duplicates like that, though, with the possible exception of the SOA. Quite possibly I have just typed more nonsense about this than the world ever needed to see.

RFC 2181 section 5: "It is meaningless for two records to ever have 
label, class, type and data all equal - servers should suppress such 
duplicates if encountered."

And RFC 7719 section 4 affirms the "different data" requirement.