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

Mark Townsley <mark@townsley.net> Thu, 09 October 2014 05:25 UTC

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From: Mark Townsley <mark@townsley.net>
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Date: Thu, 09 Oct 2014 07:25:30 +0200
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References: <A0C73AEC-6D0F-498B-9BDD-D6AF91202CCB@darou.fr> <54350D62.5050706@gmail.com> <048F40EB-A1D5-4D70-986B-9DDE55FF7C22@darou.fr> <FAFE72E2-04EC-4B27-BE1F-6E2F9F7F7A1C@employees.org> <37213B35-CAE1-4AF7-B94D-2B5EAD1C4A39@darou.fr> <5308B561-200A-455C-B2E9-4B4824ED2A1D@ecs.soton.ac.uk> <EMEW3|2f5d8f14bb6cf818659db375e4a75ba0q97FLf03tjc|ecs.soton.ac.uk|5308B561-200A-455C-B2E9-4B4824ED2A1D@ecs.soton.ac.uk> <5435D845.9030108@gmail.com>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
Archived-At: http://mailarchive.ietf.org/arch/msg/homenet/gksodPZ5jE7Ha-F4C5ZCxhFJjL0
Cc: Tim Chown <tjc@ecs.soton.ac.uk>, "homenet@ietf.org" <homenet@ietf.org>, Pierre Pfister <pierre.pfister@darou.fr>, Ole Troan <otroan@employees.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 Oct 9, 2014, at 2:35 AM, Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
> 
>> 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).

Informative reference, as we don't want to create a downref over this.

> 
> Certainly the mechanisms should support any prefix length,

I agree.

- Mark

> but
> the reality remains that only /64 subnets work properly in all
> circumstances today.
> 
>    Brian
> 
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