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

Niall O'Reilly <Niall.oReilly@ucd.ie> Mon, 13 September 2010 13:32 UTC

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Date: Mon, 13 Sep 2010 14:26:05 +0100
From: Niall O'Reilly <Niall.oReilly@ucd.ie>
Subject: Re: [dnsext] Name equivalence: Another no protocol change solution
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To: Alex Bligh <alex@alex.org.uk>
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On 09/09/10 17:30, Alex Bligh wrote:
> The problem to me seems to be divided into (at least) two:
>
> 1. Apparent pseudo-regulatory requirement to ensure TLDs operate with
> recursive sameness. This is making TLD1 == TLD2.
>
> 2. Requirement within a TLD for some sort of equivalence (possibly not
> recursive) but notably not driven by a third party's perceived
> requirements. This is making foo.TLD == bar.TLD.
>
> 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.
>
> Problem 2 cannot in general be solved by DNAME (DNAME+CNAME problem),
> as foo.tld may well exist. This can, however, in general be solved
> by provisioning algorithms.

	Alex,

	Are you assuming either
	(a) that cascaded sameness requirements won't arise. or
	(b) that the multiplicity (cardinality?) of a "sameness
	    bundle" will always be small?

	ATB
	Niall O'Reilly

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