Re: Last Call: <draft-ietf-6man-rfc4291bis-07.txt> (IP Version 6 Addressing Architecture) to Internet Standard

Mark Smith <markzzzsmith@gmail.com> Thu, 16 February 2017 20:53 UTC

Return-Path: <markzzzsmith@gmail.com>
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 7A317129689; Thu, 16 Feb 2017 12:53:25 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -0.5
X-Spam-Level:
X-Spam-Status: No, score=-0.5 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, FROM_LOCAL_NOVOWEL=0.5, HK_RANDOM_ENVFROM=0.001, HK_RANDOM_FROM=0.999, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=no autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com
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 el8IBdVekiwU; Thu, 16 Feb 2017 12:53:24 -0800 (PST)
Received: from mail-ua0-x22d.google.com (mail-ua0-x22d.google.com [IPv6:2607:f8b0:400c:c08::22d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 35B9912966D; Thu, 16 Feb 2017 12:53:24 -0800 (PST)
Received: by mail-ua0-x22d.google.com with SMTP id y9so18832183uae.2; Thu, 16 Feb 2017 12:53:24 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=LisVoQITGIQzRPgLJUrJMC8+386pHkyPo6Dw6SeDDSc=; b=tzdCbru3sGjTim95EI7Zq91k0MvABvQMDsZZKylfuoBa6moJZxar0n9+vOkooH+xmN 9TV9CyLevOeJp0DAo6Ooh8AV0/+VcFTL89dg6Kgr/FHbMffwppWsvJmeZeo8CcJM95By Obe/HUqIUctPL9HhEsKBcT0hLECUeTizvyWMBdrQoLlNTKQz9thfc5aDLVnLjrxQLfub mtrh/ikYRzTmWiCtaYhEVgnfW3lJYqOEU8J33ShC8OcOd+nILo0RhaENs1WGVTJ89LzP OOVc1tIykSH/UwF7QcudP6y++dY0hTTeLFIIlRtnrNU5NiJ7QhE8z2VzkvQEYKozL/Vo WN5A==
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=LisVoQITGIQzRPgLJUrJMC8+386pHkyPo6Dw6SeDDSc=; b=B/vKh36oNA5xjVzvVro7rn8eSY08mrMLTOI9urOvx1lUFahWtlDJyIJKl9eUnBjFip fsfpr+kLm4Fr2hqemRmDeJgVe3/bee4XKcB5e8IuSvgkngRbIYW3h4BG+4r7N1i/UEG6 PDZ+RDIVfUh6lFfVpo7pvSxuuav/HCH5393W/MUoAjykTfxayl+CKDUNXm1kaOXoX94M ruuboy+dRSMIWg48pcUGdjx5QBRfPQvmuVozt/WOKq38zoYxdoQMv71BonlyPi89Nx34 jPRF4ssdZ5hz8JoF+cN4TI5uxyGcvXrNgnEIfmiyunYrx3yAimehPWs0oQArA/CpWqtH nWbg==
X-Gm-Message-State: AMke39l2xML6ohRlZ/MrLA2nIRgc9ZCON2k9sxZqnG3wn55PToTxEQVBRt50MGbrPSUltii8RJapNriZi6R4/w==
X-Received: by 10.176.67.196 with SMTP id l62mr2180086ual.89.1487278403255; Thu, 16 Feb 2017 12:53:23 -0800 (PST)
MIME-Version: 1.0
Received: by 10.159.38.2 with HTTP; Thu, 16 Feb 2017 12:52:52 -0800 (PST)
In-Reply-To: <m2wpcpdgiv.wl-randy@psg.com>
References: <148599306190.18700.14784486605754128729.idtracker@ietfa.amsl.com> <CAN-Dau0kDiSNXsyq9-xEdS5mzLt-K+MYHqoV8aC8jDVREw8OPQ@mail.gmail.com> <8e5c950a-0957-4323-670f-f3d07f40b4df@gmail.com> <05FD5283-9A15-4819-8362-5E6B2416D617@employees.org> <CAKD1Yr3B+dw83B0+26oUqdVJE==wHUBwoWzfWBJep8f+=uM8xQ@mail.gmail.com> <d9dc153a-61a8-5976-7697-ce1ecc9c8f3f@gmail.com> <4AF83EE6-6109-491F-BE66-114724BB197B@employees.org> <m2y3x6eutl.wl-randy@psg.com> <B76B6864-5827-4AC1-9BF7-8FFF069C10F1@employees.org> <m2lgt6ed7j.wl-randy@psg.com> <4514E052-25C1-4C85-AB1D-0B53FD9DA0E1@employees.org> <CAN-Dau3VriYNUf96yZEFMMV+-4WCxBz94Lkqfg3OsCUAbVYhaw@mail.gmail.com> <m2wpcpdgiv.wl-randy@psg.com>
From: Mark Smith <markzzzsmith@gmail.com>
Date: Fri, 17 Feb 2017 07:52:52 +1100
Message-ID: <CAO42Z2xVFsV2CvPsJa3yZnsVg2_Ln1-4GP4e-GU2saJSMw3j2w@mail.gmail.com>
Subject: Re: Last Call: <draft-ietf-6man-rfc4291bis-07.txt> (IP Version 6 Addressing Architecture) to Internet Standard
To: Randy Bush <randy@psg.com>
Content-Type: text/plain; charset=UTF-8
Archived-At: <https://mailarchive.ietf.org/arch/msg/ipv6/nR7q9A1wOvi4LExp7vgidDsL62U>
Cc: 6man-chairs@ietf.org, draft-ietf-6man-rfc4291bis@ietf.org, IETF-Discussion Discussion <ietf@ietf.org>, 6man WG <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: Thu, 16 Feb 2017 20:53:25 -0000

On 17 February 2017 at 07:31, Randy Bush <randy@psg.com>; wrote:
>> What I think we need is to make it clear that there are real
>> exceptions to 64, and it is therefore not acceptable to embed 64 in
>> code.
>
> close.  64 is the exception; so slaac can work.
>
> hiding the steaming classful pile in cute places around the document
> only gets folk more annoyed.
>

So what is your objection to having a well-known addressing structure?

Objecting to it, calling it "classful", is implying that it is exactly
the same as IPv4 classful addressing. I don't think IPv6 is.

My memory of classful IPv4 addressing is that it not only specified an
addressing structure, it also specified a forwarding method based on
that structure. (e.g., the default route was only used if there
weren't any routes in the table that had the class matching the class
of the destination address.)

IPv6 doesn't. The addressing structure doesn't specify how different
bits are used during forwarding - all 128 are, using a longest match
per BCP 198.

So IPv6 specifically separates the addressing structure from the
forwarding method. I think calling that "classful" is
mischaracterising it.

Regards,
Mark.


> randy
>
> --------------------------------------------------------------------
> IETF IPv6 working group mailing list
> ipv6@ietf.org
> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6
> --------------------------------------------------------------------