Re: [homenet] homenet-prefix-assignment update - prefix length 64 and on prefix comparison

Brian E Carpenter <brian.e.carpenter@gmail.com> Thu, 09 October 2014 00:35 UTC

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Date: Thu, 09 Oct 2014 13:35:17 +1300
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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To: Tim Chown <tjc@ecs.soton.ac.uk>
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Cc: Ole Troan <otroan@employees.org>, Pierre Pfister <pierre.pfister@darou.fr>, homenet@ietf.org, Alexandru Petrescu <alexandru.petrescu@gmail.com>
Subject: Re: [homenet] homenet-prefix-assignment update - prefix length 64 and on prefix comparison
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On 09/10/2014 03:21, Tim Chown wrote:
> On 8 Oct 2014, at 14:14, Pierre Pfister <pierre.pfister@darou.fr>; wrote:
>> Why should we mandate homenet implementations to *brake* in situations where they could work fine ? Why should we voluntarily prevent a link from being configured if we actually can configure it ?
>>
>> If MUSTs are the solution, then I would rather see a ‘ISP MUST provide a /56 to customers’ than ‘Homenet MUST brake when the provided prefix is not big enough’.
> 
> But this is what the homenet arch text says in Section 3.4.1:
> http://tools.ietf.org/html/draft-ietf-homenet-arch-17#section-3.4.1
> 
> i.e. don’t go longer than /64, and ISPs should provide enough prefixes.
> 
> The why64 text is very relevant here.

And could be added as a reference. It's already in IESG Evaluation
(with one open issue that was just flagged).

Certainly the mechanisms should support any prefix length, but
the reality remains that only /64 subnets work properly in all
circumstances today.

    Brian