IETF Logo Mail Archive

Re: I-D Action: draft-linkova-6man-default-addr-selection-update-00.txt

Mark Smith <markzzzsmith@gmail.com> Wed, 05 April 2017 02:36 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 71F97127ABE for <ipv6@ietfa.amsl.com>; Tue, 4 Apr 2017 19:36:25 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.198
X-Spam-Level:
X-Spam-Status: No, score=-2.198 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=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham 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 emIonxwBw27g for <ipv6@ietfa.amsl.com>; Tue, 4 Apr 2017 19:36:23 -0700 (PDT)
Received: from mail-vk0-x229.google.com (mail-vk0-x229.google.com [IPv6:2607:f8b0:400c:c05::229]) (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 37ACC12702E for <ipv6@ietf.org>; Tue, 4 Apr 2017 19:36:20 -0700 (PDT)
Received: by mail-vk0-x229.google.com with SMTP id r69so177070vke.2 for <ipv6@ietf.org>; Tue, 04 Apr 2017 19:36:20 -0700 (PDT)
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=uotNVBn0W9eP7HRPGCPtL73+mIs553SPIe23We9TisQ=; b=TZYb1kqecJsKN0blF9/6gGtQnHQM/qSAYs6Prt3/TNFhcreKp7/5cRMiSxLO6QURS2 YdeTlTGoyN2qnEHns9EjifQhb1E+Tu18EhxrFPgExxRYYfldsDXg9Flb5rgD1X0Orc2e Rf8ubYy3ZHK5ZEEWU2ug0DPFBDYrgZC/8NNZP2mtYSuf6uT+GFo6DIJohlYhWj+Wo+Qr 6T2VxnKIXz9P8XBFW5UT5Y6VqVGO50mPfYvcuuf2dJb6h+lFH0L7HKIGHH3cph05+nCj OCcWTdNYeI5c40yUkPox7rRQalZmB9qGJeTZoIeBmtyJFpSp2Ct+nuJp0Xu5o2Fs6qh+ F+sg==
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=uotNVBn0W9eP7HRPGCPtL73+mIs553SPIe23We9TisQ=; b=CJObdAF+nq/aCI3E/ae8sY16RxVdja/TvzmquC6majmTSXzIy/z0jwFY7eKmcn4T2X im4heNMnYC8xvS9JigdonRiMe4e9BW9bKRBGoxv5FgyLqA67p+7lD+BvWmP2UmAVa2wE Q7vzmCnoW3hPH5dq6YM0hwr5bMtBN6fpqvteaEat7d8PPEMt0trtTsK6mPk3laDhNHJa 6aVOqUGnZ7hI0qaJA52A1fzfcWunfkIO5hGuEnkkHzrByc/gU+gmdQH11QBC2b4wHI2s wAvzoAakfACXihvwxMn7QMRnZAFGIcHdRIdpMqtktwJYEKLzOTEKVgsCegSFl2QBoUzh KkiQ==
X-Gm-Message-State: AFeK/H3wGbR1/7a11Gg+vX/ozwwh4wtHx3s6ggvVcti/U2+bfP2sRslKWmx2Jf3AIrLWZFArAsEsfzT4PZ9mWQ==
X-Received: by 10.31.162.9 with SMTP id l9mr12341711vke.123.1491359779226; Tue, 04 Apr 2017 19:36:19 -0700 (PDT)
MIME-Version: 1.0
Received: by 10.159.55.177 with HTTP; Tue, 4 Apr 2017 19:35:48 -0700 (PDT)
In-Reply-To: <1f8d497b-3286-2074-7c2e-f224ceda55a8@gmail.com>
References: <149093611351.8864.5121956820429281359@ietfa.amsl.com> <1f8d497b-3286-2074-7c2e-f224ceda55a8@gmail.com>
From: Mark Smith <markzzzsmith@gmail.com>
Date: Wed, 05 Apr 2017 12:35:48 +1000
Message-ID: <CAO42Z2wREkid1tCNCQz9HriFC_xD9K=WB=vS4UO3oEHMSfsN7g@mail.gmail.com>
Subject: Re: I-D Action: draft-linkova-6man-default-addr-selection-update-00.txt
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
Cc: 6man <ipv6@ietf.org>
Content-Type: text/plain; charset="UTF-8"
Archived-At: <https://mailarchive.ietf.org/arch/msg/ipv6/vLF70lQUl4KhttuJunfg4ij72r8>
X-BeenThere: ipv6@ietf.org
X-Mailman-Version: 2.1.22
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: Wed, 05 Apr 2017 02:36:25 -0000

On 5 April 2017 at 08:18, Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
> As far as I can see this proposal makes sense and should work. But:
>
>>    1.  The link-local address of the router in the new layer 2 domain
>>        might be the same as the link-local address of the "old" router
>>        (it's quite common to have link-local address on routers to be
>>        explicitly configured, especially in VRRP-enabled environments)
>
> Wow. Shouldn't there also be an operational recommendation to configure
> non-clashing or at least highly-unlikely-to-clash addresses for
> such routers?
>

I think RFC8064, "Recommendation on Stable IPv6 Interface Identifiers"
is indirectly making that recommendation.

One of the use cases of RFC7217 is for router interface's Link-Local
addresses, and to not use use the interface's MAC address as the
Net_Iface value (e.g., module/slot number, ifindex instead), so that
the router's Link-Local IID is both unique and doesn't change if the
physical interface module is replaced, which usually means an
interface MAC address change too.

Regards,
Mark.

v2.23.0 | Report a Bug | By Email