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

Tim Chown <tjc@ecs.soton.ac.uk> Wed, 08 October 2014 14:22 UTC

Return-Path: <tjc@ecs.soton.ac.uk>
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 C424D1A1B24 for <homenet@ietfa.amsl.com>; Wed, 8 Oct 2014 07:22:58 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.006
X-Spam-Level:
X-Spam-Status: No, score=-2.006 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RP_MATCHES_RCVD=-0.786, SPF_NEUTRAL=0.779] 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 DGnIMS9W7OLE for <homenet@ietfa.amsl.com>; Wed, 8 Oct 2014 07:22:55 -0700 (PDT)
Received: from falcon.ecs.soton.ac.uk (falcon.ecs.soton.ac.uk [IPv6:2001:630:d0:f102::25e]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 659221A1B2B for <homenet@ietf.org>; Wed, 8 Oct 2014 07:22:53 -0700 (PDT)
Received: from falcon.ecs.soton.ac.uk (localhost [127.0.0.1]) by falcon.ecs.soton.ac.uk (8.13.8/8.13.8) with ESMTP id s98ELfnE010189; Wed, 8 Oct 2014 15:21:41 +0100
X-DKIM: Sendmail DKIM Filter v2.8.2 falcon.ecs.soton.ac.uk s98ELfnE010189
DKIM-Signature: v=1; a=rsa-sha1; c=simple/simple; d=ecs.soton.ac.uk; s=201304; t=1412778101; bh=FwhbJlS8Bm1HXHPoZt8XT3Q4pys=; h=Mime-Version:Subject:From:In-Reply-To:Date:Cc:References:To; b=270iIaRqFSvij26ck4r/23bM4gVxi2WtuFqQCaFMuKjMMcQeEyJnCihqUtwxk2RYK lPimZFCORdLC0Du59GAc3uuBneD1WkR2zoVzDWqxS4g5O0hMfgvhDJ95cpPEOA0GsI Q/OjEsj8sDo8lAkQnQn27SNJsMlWvyUVcSIKgeqU=
Received: from gander.ecs.soton.ac.uk ([2001:630:d0:f102:250:56ff:fea0:401]) by falcon.ecs.soton.ac.uk (falcon.ecs.soton.ac.uk [2001:630:d0:f102:250:56ff:fea0:68da]) envelope-from <tjc@ecs.soton.ac.uk> with ESMTP (valid=N/A) id q97FLf3070111708wd ret-id none; Wed, 08 Oct 2014 15:21:41 +0100
Received: from [IPv6:2001:630:d0:ed10:8499:1c3c:701b:8c64] ([IPv6:2001:630:d0:ed10:8499:1c3c:701b:8c64]) (authenticated bits=0) by gander.ecs.soton.ac.uk (8.13.8/8.13.8) with ESMTP id s98ELdBG004456 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NO); Wed, 8 Oct 2014 15:21:39 +0100
Content-Type: multipart/alternative; boundary="Apple-Mail=_1A9D3973-01B9-406A-9DEE-34E4B0259839"
Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\))
From: Tim Chown <tjc@ecs.soton.ac.uk>
In-Reply-To: <37213B35-CAE1-4AF7-B94D-2B5EAD1C4A39@darou.fr>
Date: Wed, 8 Oct 2014 15:21:38 +0100
Message-ID: <EMEW3|2f5d8f14bb6cf818659db375e4a75ba0q97FLf03tjc|ecs.soton.ac.uk|5308B561-200A-455C-B2E9-4B4824ED2A1D@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>
To: Pierre Pfister <pierre.pfister@darou.fr>
X-Mailer: Apple Mail (2.1878.6)
X-ECS-MailScanner: Found to be clean, Found to be clean
X-smtpf-Report: sid=q97FLf307011170800; tid=q97FLf3070111708wd; client=relay,forged,no_ptr,ipv6; mail=; rcpt=; nrcpt=4:0; fails=0
X-ECS-MailScanner-Information: Please contact the ISP for more information
X-ECS-MailScanner-ID: s98ELfnE010189
X-ECS-MailScanner-From: tjc@ecs.soton.ac.uk
Archived-At: http://mailarchive.ietf.org/arch/msg/homenet/Iupejnp6T-9p7rI6SiOgC5qmI74
Cc: Ole Troan <otroan@employees.org>, 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: Wed, 08 Oct 2014 14:22:58 -0000

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.

Tim