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

Alexandru Petrescu <alexandru.petrescu@gmail.com> Thu, 09 October 2014 09:30 UTC

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Date: Thu, 09 Oct 2014 11:29:57 +0200
From: Alexandru Petrescu <alexandru.petrescu@gmail.com>
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To: Brian E Carpenter <brian.e.carpenter@gmail.com>, 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
Subject: Re: [homenet] homenet-prefix-assignment update - prefix length 64 and on prefix comparison
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Le 09/10/2014 02:35, Brian E Carpenter a écrit :
> 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.

But this is new work, not work documenting existing practice.

Alex

>
>      Brian
>
>
>