IETF Logo Mail Archive

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

Brian E Carpenter <brian.e.carpenter@gmail.com> Sat, 08 April 2017 13:34 UTC

Return-Path: <brian.e.carpenter@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 EF5F7127010 for <ipv6@ietfa.amsl.com>; Sat, 8 Apr 2017 06:34:35 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -0.8
X-Spam-Level:
X-Spam-Status: No, score=-0.8 tagged_above=-999 required=5 tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_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 d8_OCPIySx2V for <ipv6@ietfa.amsl.com>; Sat, 8 Apr 2017 06:34:33 -0700 (PDT)
Received: from mail-it0-x232.google.com (mail-it0-x232.google.com [IPv6:2607:f8b0:4001:c0b::232]) (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 2E5EB1274D2 for <ipv6@ietf.org>; Sat, 8 Apr 2017 06:34:33 -0700 (PDT)
Received: by mail-it0-x232.google.com with SMTP id y18so6605591itc.1 for <ipv6@ietf.org>; Sat, 08 Apr 2017 06:34:33 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:references:cc:from:organization:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding; bh=t1T47TuwRRRbHNQ3OrLQ3evFtUhoLERFJlDLw+ftGsE=; b=elKcOhsEJ/6irryPEzqd+zTGqlOCDXx1JUNMeV5WihscLnwgbkwsz6a++bQFHs4aDS cQNP0y68ygKi1motH8o/aDRNOANz188wTGf2WcO8Tr8Ny9C/xbh7h5tzhUlbmuUQa3Na i2+9kTqQw3dqPfLeTyGV6x++fprLMK9SjzTIqapOcAGpYFdTXaJ8ZqmWjD/EVNjoDcXD eJcr7wV/aJufS51GcDauZ8ijbwVkkzT6jMGErwWn6n5NXkBWtwQVXtucs/pmbPBK5xWx LXS6WFQGbA67XiytiUVeZ6tlMC/8c0tIVUzMTdsOLSoIugsLyH/h0raBv+j5zk1MeiqY UnzQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:cc:from:organization :message-id:date:user-agent:mime-version:in-reply-to :content-transfer-encoding; bh=t1T47TuwRRRbHNQ3OrLQ3evFtUhoLERFJlDLw+ftGsE=; b=F1Ea4wrVNIiyDeKNtwvYHNnffVqelz4z0ovv+jL4g2+36gzW3I1l/r6IajjUe+ZV4k K4y0GEq251yBJaUM73PM2bAXFhNDuZJKpBLsC1YLK8ecMoNdFJE5Kdsdk1Yx+q5Ygf1I raWp68glqbFvbmCIHhLOhag0JiCqyPlLHNC6RErt4oIliqrIIb2/RuWvNXEe5nGBKNvh 8sFcXQC6lpRc79QPUnlnD3PE0txfvLONerPaTmWEXL7QoDmFMI1cR4HeBpkb5a/I7CCv 6o8n4CH3lyOn5/7jaqX9bLM7L+DmVOYMeoApRhfWxo38fpMCpqWNLTdBgQxrawk/9VVN tIMQ==
X-Gm-Message-State: AN3rC/7XC33HUVIuvJ9csr/q3lqmJSFJPRIv8xPrvssz8tpFnFRWrsEV izB6Ju/YlJN6NQ==
X-Received: by 10.36.50.142 with SMTP id j136mr4319961ita.111.1491658472551; Sat, 08 Apr 2017 06:34:32 -0700 (PDT)
Received: from [172.16.11.95] (50-76-68-137-static.hfc.comcastbusiness.net. [50.76.68.137]) by smtp.gmail.com with ESMTPSA id o97sm3797083ioi.53.2017.04.08.06.34.31 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 08 Apr 2017 06:34:31 -0700 (PDT)
Subject: Re: I-D Action: draft-linkova-6man-default-addr-selection-update-00.txt
To: Lorenzo Colitti <lorenzo@google.com>
References: <149093611351.8864.5121956820429281359@ietfa.amsl.com> <1f8d497b-3286-2074-7c2e-f224ceda55a8@gmail.com> <CAO42Z2wREkid1tCNCQz9HriFC_xD9K=WB=vS4UO3oEHMSfsN7g@mail.gmail.com> <CAFU7BAR1ZJBnu=+pjNGYD37YghXhYRTJAUpcSd=XvtJY=4k4UA@mail.gmail.com> <CAAedzxrqbcoVu0YMnEz=uNNqnuAnD=ToBU9P_3K41KdWBWqGKw@mail.gmail.com> <CAFU7BARyPiPncGtidixP2A248X_2mS04cJrfW3TAyV8txKHAsw@mail.gmail.com> <CAAedzxq4ObCLgeizkcmXRNUVJF_2Mv5xWy_5G=YGws15fC-_Og@mail.gmail.com> <696ab419-ed78-7a52-94be-96ea1e2d3e58@gmail.com> <CAKD1Yr0RBtk33hSv_qnBqPrTgpbjJvoX+vFJd64ebeBAUGtUtw@mail.gmail.com> <7d82c914-bbea-2b6c-3f63-52da383c47a9@gmail.com> <CAKD1Yr1UyAafXtQ3DythK9HhJfnOiZ6FGc1hFYUTRe74oyW+9w@mail.gmail.com>
Cc: Erik Kline <ek@google.com>, Jen Linkova <furry13@gmail.com>, 6man <ipv6@ietf.org>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
Message-ID: <fdc63177-96de-d1d6-d7eb-178d07febe1d@gmail.com>
Date: Sun, 09 Apr 2017 01:34:30 +1200
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0
MIME-Version: 1.0
In-Reply-To: <CAKD1Yr1UyAafXtQ3DythK9HhJfnOiZ6FGc1hFYUTRe74oyW+9w@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit
Archived-At: <https://mailarchive.ietf.org/arch/msg/ipv6/rwIWjLU5OtLSNELrADmzEAhQrrk>
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: Sat, 08 Apr 2017 13:34:36 -0000

On 08/04/2017 03:12, Lorenzo Colitti wrote:
> On Fri, Apr 7, 2017 at 11:59 PM, Brian E Carpenter <
> brian.e.carpenter@gmail.com> wrote:
> 
>>> How do you configure RFC7217 such that the two VRRP routers in a given
>> pair
>>> have the same link-local address, but other routers don't?
>>
>> I'm totally ignorant about how VRRP setups are created, so I can't answer
>> that.
>>
> 
> This problem isn't really specific to VRRP, it's specific to 7217. The
> determinism in 7217 is obtained by running a hash function over a set of
> configuration variable. To use it for this purpose you have to ensure that
> all the configuration variables are the same for a given pair.
> 
> If you want different VRRP groups to have different 7217 addresses then you
> need additional entropy. The VRRP group is still only 8 bits long, and the
> list of parameters in 7217 doesn't leave much room to maneuver...

I see. So maybe a different approach is needed. The objective is not
privacy for VRRP routers, after all; it's non-clashing LL addresses.

    Brian
>

v2.23.0 | Report a Bug | By Email