Re: IID length text [was Re: Review of draft-ietf-6man-rfc4291bis-06]

David Farmer <farmer@umn.edu> Tue, 17 January 2017 04:55 UTC

Return-Path: <farmer@umn.edu>
X-Original-To: ipv6@ietfa.amsl.com
Delivered-To: ipv6@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DC8C5129A32 for <ipv6@ietfa.amsl.com>; Mon, 16 Jan 2017 20:55:43 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -6.999
X-Spam-Level:
X-Spam-Status: No, score=-6.999 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, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_SORBS_SPAM=0.5, RP_MATCHES_RCVD=-3.199, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=umn.edu
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 qPnFNT8nud9s for <ipv6@ietfa.amsl.com>; Mon, 16 Jan 2017 20:55:42 -0800 (PST)
Received: from mta-p8.oit.umn.edu (mta-p8.oit.umn.edu [134.84.196.208]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 8AB39129A2F for <ipv6@ietf.org>; Mon, 16 Jan 2017 20:55:42 -0800 (PST)
Received: from localhost (unknown [127.0.0.1]) by mta-p8.oit.umn.edu (Postfix) with ESMTP id 315D379F for <ipv6@ietf.org>; Tue, 17 Jan 2017 04:55:41 +0000 (UTC)
X-Virus-Scanned: amavisd-new at umn.edu
Received: from mta-p8.oit.umn.edu ([127.0.0.1]) by localhost (mta-p8.oit.umn.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ihuvN5XCjtlI for <ipv6@ietf.org>; Mon, 16 Jan 2017 22:55:41 -0600 (CST)
Received: from mail-vk0-f72.google.com (mail-vk0-f72.google.com [209.85.213.72]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mta-p8.oit.umn.edu (Postfix) with ESMTPS id 025B8850 for <ipv6@ietf.org>; Mon, 16 Jan 2017 22:55:40 -0600 (CST)
Received: by mail-vk0-f72.google.com with SMTP id 75so80591770vkm.0 for <ipv6@ietf.org>; Mon, 16 Jan 2017 20:55:40 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=umn.edu; s=google; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=N6bEyu/fIzFwjs1RaG8S9R5ALzTwXur8WIMp2YPRuVI=; b=XByNkt9bXiJ3KfyW/xZptxm3a0Ai8m8lZdeNzTv2sCXvYkzppFpr9jO617fZvA/Ys/ CuKYGP+ZSGxmQiUiZRWMUwBYWkz2F9E51z+GAV1a9dJ5ZQRPO2Gg1EaLt/bb14cwvQgf suZR+DrSTCE62C9NtaNUowzhaQ8tXvabV+LVoth4Mb3rMV+bcd4aSYiWYacSOFX0itlR yVbYqix9T3Dp82kB0lDtg2C3DFUYR6O9gjku3NArK8JPYwFYP0A0pHg1K5k/yKcnMWIx bZSUJJueSefimrsCVJNnWRpS8j48vwuURihuaOXg9XZmyfp78QV4MBtScWnCkgs+ViWc y8Yg==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=N6bEyu/fIzFwjs1RaG8S9R5ALzTwXur8WIMp2YPRuVI=; b=QQ1RKsJyzmuruvG6PFobBawJzESxXEr4A+hz6D1M8Q/HX1DsLFUvuip9jWhnU6FgBK G/6fhAZtsqwE8o/OPWSsWOt+0PoVPMaAQBtq93vPmzbUdYwcPOHS/6ho7DarHBT8dDS0 End6c5brnYpdkPsUWQkFntwHLsJ7V+wrRikAMyU3HGedU2QePglwhW1rc52JTlPz3ja3 yjpH2RRsoj04/PNbBiGI3P0FEHIfScnU5p2UzZkcSKa+PUi+rvuxVy3C5m4HbwvEq4dh xvfOmVeozMzrhfsSyRMlTYQKkXbU1W8+9D0mzqDPBT/rPNhKhSNmP9DeaeID5XL+wug3 rUyg==
X-Gm-Message-State: AIkVDXJ1WfJtF0BDi6gK6DBIQWqMp2SmVZeLi+tfdMWdXfPKCEcCpSsMQma+EQrtEJBvQX7GlE2Bfdhfg8vK4WTlrOmdIO/Vv3dwARNgzjgJ7an8BBQ19h9Rgu6v9R9ZgQh0njq1jZUUqJ/+KNE=
X-Received: by 10.176.91.214 with SMTP id z22mr18380053uae.135.1484628940088; Mon, 16 Jan 2017 20:55:40 -0800 (PST)
X-Received: by 10.176.91.214 with SMTP id z22mr18380048uae.135.1484628939932; Mon, 16 Jan 2017 20:55:39 -0800 (PST)
MIME-Version: 1.0
Received: by 10.103.84.15 with HTTP; Mon, 16 Jan 2017 20:55:39 -0800 (PST)
In-Reply-To: <c20f3c50-e848-ac78-4539-7bda3d6622da@gmail.com>
References: <148406593094.22166.2894840062954191477.idtracker@ietfa.amsl.com> <m2fukqbbwv.wl-randy@psg.com> <F6953234-3F85-4E28-9861-433ADD01A490@gmail.com> <m2wpdzhncn.wl-randy@psg.com> <82245ef2-cd34-9bd6-c04e-f262e285f983@gmail.com> <m2d1frhjfn.wl-randy@psg.com> <18e6e13c-e605-48ff-4906-2d5531624d64@gmail.com> <CAKD1Yr1cvZ8Y3+bHeML=Xwqr+YgDspZGnZi=jqQj4qe2kMc4zw@mail.gmail.com> <m2lguffnco.wl-randy@psg.com> <CAKD1Yr1TrTiPRdyutobmb_77XJ7guNzLrg=H_p7qi4BfQ8V=GA@mail.gmail.com> <m2d1frfm6m.wl-randy@psg.com> <CAKD1Yr2Njjd8_Mr+6TRFF6C5pdcX4yFgpFVyEkykDuytu2B8mg@mail.gmail.com> <2A5073777007277764473D78@PSB> <4596c3d4-a337-f08e-7909-f14270b7085f@gmail.com> <CAN-Dau06R3iYRpYLADhvHox4C9qdsJCuxFsJapRhOQcWT4qk_g@mail.gmail.com> <CAO42Z2weZcoHiBzN94QAQ9WGhWR16PmMMFNg=5YLmr_dhPjjpA@mail.gmail.com> <fcf580ec-3617-ca5f-5337-37acb6e928ba@gmail.com> <64cfae99-3d70-25b7-09b1-a1d327c563bf@si6networks.com> <c20f3c50-e848-ac78-4539-7bda3d6622da@gmail.com>
From: David Farmer <farmer@umn.edu>
Date: Mon, 16 Jan 2017 22:55:39 -0600
Message-ID: <CAN-Dau1QAo9yHCO7=PSWi1anFDK=7sfXR-p-qG_XQTfHPtGEWw@mail.gmail.com>
Subject: Re: IID length text [was Re: Review of draft-ietf-6man-rfc4291bis-06]
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
Content-Type: multipart/alternative; boundary=f403045f8cd69698f60546431c55
Archived-At: <https://mailarchive.ietf.org/arch/msg/ipv6/jkUcTwiGb1F6GGYGVRILPeKZYO8>
Cc: Fernando Gont <fgont@si6networks.com>, 6man <ipv6@ietf.org>
X-BeenThere: ipv6@ietf.org
X-Mailman-Version: 2.1.17
Precedence: list
List-Id: "IPv6 Maintenance Working Group \(6man\)" <ipv6.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/ipv6>, <mailto:ipv6-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/ipv6/>
List-Post: <mailto:ipv6@ietf.org>
List-Help: <mailto:ipv6-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/ipv6>, <mailto:ipv6-request@ietf.org?subject=subscribe>
X-List-Received-Date: Tue, 17 Jan 2017 04:55:44 -0000

On Mon, Jan 16, 2017 at 4:04 PM, Brian E Carpenter <
brian.e.carpenter@gmail.com> wrote:

> In line...
> On 17/01/2017 08:59, Fernando Gont wrote:
> > On 01/14/2017 04:49 PM, Brian E Carpenter wrote:
> >> A modest suggestion:
> >>
> >> OLD
> >>    For all unicast addresses, except those that start with the binary
> >>    value 000, Interface IDs are required to be 64 bits long.  Background
> >>    on the 64 bit boundary in IPv6 addresses can be found in [RFC7421].
> >>
> >> NEW
> >>    IPv6 routing is based on prefixes of any valid length up to 128
> [BCP198].
> >>    For example, [RFC6164] standardises 127 bit  prefixes on
> point-to-point
> >>    links. However, consistent use of Stateless Address Autoconfiguration
> >>    (SLAAC)[RFC4862] requires that all interfaces on a link use the same
> length
> >>    of Interface ID. In practice, this means that to guarantee
> interoperability
> >>    of SLAAC, a fixed length of Interface ID is necessary.
> >
> > fixed as "all nodes on the link use the same IID length" or as in "a
> > hardcoded IID length, as the current 64 value"?
> >
> > If the former, I agree. If the later, I don't.
>
> You're right, that choice of word could be contradictory.
> I suggest s/fixed/consistent/.
>
>     Brian
>

With that change I think the use of "consistent" in the previous sentence
is somewhat redundant.  How about;

   However, use of Stateless Address Autoconfiguration (SLAAC)[RFC4862]
   requires that all interfaces on a link use the same length of Interface
ID.
   In practice, this means that to guarantee interoperability of SLAAC, a
   consistent length of Interface ID is necessary.


-- 
===============================================
David Farmer               Email:farmer@umn.edu
Networking & Telecommunication Services
Office of Information Technology
University of Minnesota
2218 University Ave SE        Phone: 612-626-0815
Minneapolis, MN 55414-3029   Cell: 612-812-9952
===============================================