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

Return-Path: <brian.e.carpenter@gmail.com>
X-Original-To: homenet@ietfa.amsl.com
Delivered-To: homenet@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 723301A87AC for <homenet@ietfa.amsl.com>; Wed, 8 Oct 2014 17:35:22 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2
X-Spam-Level:
X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, SPF_PASS=-0.001] autolearn=ham
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id c4XrbYnRSWdv for <homenet@ietfa.amsl.com>; Wed, 8 Oct 2014 17:35:20 -0700 (PDT)
Received: from mail-oi0-x22c.google.com (mail-oi0-x22c.google.com [IPv6:2607:f8b0:4003:c06::22c]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 78CCD1A87AF for <homenet@ietf.org>; Wed, 8 Oct 2014 17:35:17 -0700 (PDT)
Received: by mail-oi0-f44.google.com with SMTP id x69so469691oia.3 for <homenet@ietf.org>; Wed, 08 Oct 2014 17:35:16 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=message-id:date:from:organization:user-agent:mime-version:to:cc :subject:references:in-reply-to:content-type :content-transfer-encoding; bh=6rXdioSBymwfJ/cTyeeasKV1vittm/TUb9DDGdI8tzY=; b=IUW8xQ0eNTgM+lXhp1DclfJM+ehynHPwJ6wWg+mHvyf+gsV5ary/8kZg95FeshwfSB FrZgrgyj266kavlgxHd24pHL0/Ws8w7FNzseDZaAzSLdaKIXb1qKtE99CNsSrxruMWO8 rpPpz8u2i348/5DoByQ+jz+zjwTieHz2cVQ+xraClOqIadhsMqpDsfOq9YglfYgCHJQN GDGznlZTGnsZ5+XX0zrU50Yg5S7KTdnRPViDSt4hg0+87JzyKnStBF4SZHC2hsK4xeDE 4GloLt3EUChU5At17Ux0Bjd8GvsUc5y22pGnypARgXwoFicm+WbEnYzX5nzFwbnugDm+ Y1Cw==
X-Received: by 10.60.51.5 with SMTP id g5mr16970130oeo.19.1412814916866; Wed, 08 Oct 2014 17:35:16 -0700 (PDT)
Received: from [192.168.178.23] (129.195.69.111.dynamic.snap.net.nz. [111.69.195.129]) by mx.google.com with ESMTPSA id qi6sm1358654oeb.9.2014.10.08.17.35.12 for <multiple recipients> (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 08 Oct 2014 17:35:15 -0700 (PDT)
Message-ID: <5435D845.9030108@gmail.com>
Date: Thu, 09 Oct 2014 13:35:17 +1300
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
User-Agent: Thunderbird 2.0.0.6 (Windows/20070728)
MIME-Version: 1.0
To: Tim Chown <tjc@ecs.soton.ac.uk>
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>
In-Reply-To: <EMEW3|2f5d8f14bb6cf818659db375e4a75ba0q97FLf03tjc|ecs.soton.ac.uk|5308B561-200A-455C-B2E9-4B4824ED2A1D@ecs.soton.ac.uk>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Archived-At: http://mailarchive.ietf.org/arch/msg/homenet/aPJA-MYuu4NT1a_pVV9bEO10Yks
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
X-BeenThere: homenet@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: <homenet.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/homenet>, <mailto:homenet-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/homenet/>
List-Post: <mailto:homenet@ietf.org>
List-Help: <mailto:homenet-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/homenet>, <mailto:homenet-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 09 Oct 2014 00:35:22 -0000

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