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Re: [dnsext] Name equivalence: Another no protocol change solution

Alex Bligh <alex@alex.org.uk> Mon, 13 September 2010 16:52 UTC

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Date: Mon, 13 Sep 2010 17:49:56 +0100
From: Alex Bligh <alex@alex.org.uk>
Reply-To: Alex Bligh <alex@alex.org.uk>
To: Niall O'Reilly <Niall.oReilly@ucd.ie>
cc: namedroppers@ops.ietf.org, Alex Bligh <alex@alex.org.uk>
Subject: Re: [dnsext] Name equivalence: Another no protocol change solution
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--On 13 September 2010 17:36:31 +0100 Niall O'Reilly <Niall.oReilly@ucd.ie> 
wrote:

> On 13/09/10 17:20, Alex Bligh wrote:
>> So you mean:
>>
>> $ORIGIN c1.d1.
>>      b2    IN DNAME b1.c1.d1.
>>      b1    IN NS ns.example.com.
>
> 	That's what I had in mind, with a bunch of MX, SRV, and
> 	whatever else belonging to b1.c1.d1. as well, and needing
> 	to be projected (mirrored, shadowed, ...) onto b2.c1.d1.

Right, and the coexistence of those other records is the problem, yes?
If so, I wrote:
> 1. Apparent pseudo-regulatory requirement to ensure TLDs operate with
> recursive sameness. This is making TLD1 == TLD2.
...
> Problem 1 can, it seems to me, be solved by DNAME. DNAME only doesn't
> do the job when there is a record at the apex, because DNAME+CNAME
> can't coexist. Few if any TLDs have records at their apexes.

By assumption (last sentence) there are no records that need to
be at b2.

IE I am assuming problem 1 (need for recursive sameness beyond
that which provisioning could give us) only applies in circumstances
where coexisting records do not exist. So far the only use
people who have said "provisioning doesn't work for this" are
TLDs.

-- 
Alex Bligh

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