Re: [DNSOP] draft-tale-dnsop-edns-clientid

Ray Bellis <ray@bellis.me.uk> Wed, 29 March 2017 15:47 UTC

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From: Ray Bellis <ray@bellis.me.uk>
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Date: Wed, 29 Mar 2017 10:47:43 -0500
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Subject: Re: [DNSOP] draft-tale-dnsop-edns-clientid
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On 29/03/2017 10:41, Dave Lawrence wrote:

> Well yes, but there's another simple test, the limited Expert Review
> guidance against duplicate functionality.  Both xpf and clientid
> provide the functionality of conveying an IP address in an EDNS0
> option.

Whilst you're correct that they both carry information that happens to
have the same format, they have different semantic intent, and it would
IMHO cause confusion if both were carried in a packet with the same
option code.

It's effectively the same argument about TXT records - there's plenty of
things that use TXT format, but it's preferred that separate RRTYPEs are
used to indicate the use case.

Ray