IETF Logo Mail Archive

Re: A common problem with SLAAC in "renumbering" scenarios

Richard Patterson <richard@helix.net.nz> Tue, 05 February 2019 10:16 UTC

Return-Path: <richard@helix.net.nz>
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 034C6130E25 for <ipv6@ietfa.amsl.com>; Tue, 5 Feb 2019 02:16:06 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.042
X-Spam-Level:
X-Spam-Status: No, score=-2.042 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.142, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=helix-net-nz.20150623.gappssmtp.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 un13n8Wx1Yti for <ipv6@ietfa.amsl.com>; Tue, 5 Feb 2019 02:16:02 -0800 (PST)
Received: from mail-yb1-xb2c.google.com (mail-yb1-xb2c.google.com [IPv6:2607:f8b0:4864:20::b2c]) (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 894AB130F24 for <ipv6@ietf.org>; Tue, 5 Feb 2019 02:16:02 -0800 (PST)
Received: by mail-yb1-xb2c.google.com with SMTP id j189so322538ybj.9 for <ipv6@ietf.org>; Tue, 05 Feb 2019 02:16:02 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=helix-net-nz.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=9luqLHCG5zHkEX4tSMIn7H1MoojJGr+6oOxytDQq0hQ=; b=DNCqZNnFCsWxxlG4Vy3JPM3L77Oy3IiQJZ/RVJFG9CvEBrMXy/B0tUFnnYVkTZP3VD WixibLCYHj5Ef/GyNy1h8LqDG1pdMXfveR57FtPvuhd2WxZut/AT6l8OePbRg+ZcCi8l p/KkSlFY8y/PANIhqZFLRnMOR229XJEFV8IOl3jOutN3T7mN20eGhDuqznQNGxZtLLpE p0NK4k2uhopGd0apq99hhodiiAtsyIc4o7/UuHDtwqKbS8uIGrpXZmY/+8Zj4Einnexg qxiyvletB0s0ThEEehhxqsAi+PvpqFfJOSTfCwZzGI4S7P2WLGrVob+IadOCWBv30J63 IiCQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=9luqLHCG5zHkEX4tSMIn7H1MoojJGr+6oOxytDQq0hQ=; b=f0MpFRtWT2FplQaMbDcVypF4OEKJylmVMZxFAbn48/9O00HLjYyqCFe+K8ok1IdgAa VvOD8zsR05XrPafenJRtCfJDGmjX4EBSMCc85ev/8kXvH0j7FTm1tZaxnxgMJXErOY/g h856eCwKCwmFUwXPqU/W29LGtZm66R41gIdAAIFzSv41DsPaKB4vbzzfKjrazW70jpZ7 rJADmQvaM0TYvwU6fklHhfGSlRAabej75Ek4kqZuBDq5YzBQ6jUuBe+0/q9VYY9f0aCW yzb3lhFyMOBlO8eI7+ZYN60Zq5mVj3fICT2q09X5P2R/eZschB1sxH8bxuXMDRImD05N GUGQ==
X-Gm-Message-State: AHQUAuZMCPpoOwa8WopX633XbcIDSWaj4XGTP3CNjxxTJlRYTh1pDBiV 6txTQ5gEz/qKVx5jpMMUf3OVqX3u70g=
X-Google-Smtp-Source: AHgI3IZdrBAsbnYML1uwve60D2O4/VX7DSXsweh5qfFqvrtLkQdxTLR2mVD3gqFiIgK/lfl7BKZ75Q==
X-Received: by 2002:a25:9a45:: with SMTP id r5mr3200069ybo.139.1549361761353; Tue, 05 Feb 2019 02:16:01 -0800 (PST)
Received: from mail-yb1-f176.google.com (mail-yb1-f176.google.com. [209.85.219.176]) by smtp.gmail.com with ESMTPSA id u4sm1659391ywl.29.2019.02.05.02.15.59 for <ipv6@ietf.org> (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 05 Feb 2019 02:15:59 -0800 (PST)
Received: by mail-yb1-f176.google.com with SMTP id s17so778864ybp.6 for <ipv6@ietf.org>; Tue, 05 Feb 2019 02:15:59 -0800 (PST)
X-Received: by 2002:a25:8108:: with SMTP id o8mr3131393ybk.83.1549361759600; Tue, 05 Feb 2019 02:15:59 -0800 (PST)
MIME-Version: 1.0
References: <60fabe4b-fd76-4b35-08d3-09adce43dd71@si6networks.com> <alpine.DEB.2.20.1901311236320.5601@uplift.swm.pp.se> <m1gpCcz-0000FlC@stereo.hq.phicoh.net> <ddd28787-8905-bafd-3546-2ceef436c8b0@si6networks.com> <m1gptWx-0000G3C@stereo.hq.phicoh.net> <69609C58-7205-4519-B17A-4FBC8AE2EA16@employees.org> <d40b41c3-ff1b-cab4-a8de-16692a78e8fd@go6.si> <D1E45CAD-08D0-43D4-90F7-C4DD44CB32C0@employees.org> <alpine.DEB.2.20.1902041330531.23912@uplift.swm.pp.se> <77ecf321-b46e-4f25-7f68-05b15714a99e@si6networks.com>
In-Reply-To: <77ecf321-b46e-4f25-7f68-05b15714a99e@si6networks.com>
From: Richard Patterson <richard@helix.net.nz>
Date: Tue, 05 Feb 2019 10:15:47 +0000
X-Gmail-Original-Message-ID: <CAHL_VyDdHuEAc9UdeiRp9f+c0tdzyoLwPY1rJbZmbWAuq96Uuw@mail.gmail.com>
Message-ID: <CAHL_VyDdHuEAc9UdeiRp9f+c0tdzyoLwPY1rJbZmbWAuq96Uuw@mail.gmail.com>
Subject: Re: A common problem with SLAAC in "renumbering" scenarios
To: Fernando Gont <fgont@si6networks.com>
Cc: Mikael Abrahamsson <swmike@swm.pp.se>, Ole Troan <otroan@employees.org>, 6man WG <ipv6@ietf.org>
Content-Type: text/plain; charset="UTF-8"
Archived-At: <https://mailarchive.ietf.org/arch/msg/ipv6/j5eZkdPrKSC_OtWLMgTQq_oQB9E>
X-BeenThere: ipv6@ietf.org
X-Mailman-Version: 2.1.29
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, 05 Feb 2019 10:16:06 -0000

On Tue, 5 Feb 2019 at 04:08, Fernando Gont <fgont@si6networks.com> wrote:

> > My current ISP has stated that their intention is to make sure people
> > keep the same prefix as long as their HGW is alive,
>
> So.. what happens when the CPE crashes and reboots?

The lease state is stored on the BNG/DHCP server.  If the CPE uses a
stable DUID, hasn't sent a Release, and returns within the valid
lifetime, then it should receive the same PD.   Some BNG vendors also
track an additional lease lifetime longer than the valid lifetime, to
keep old leases in a reserved/held state allowing a CPE to retain the
same PD even after the valid lifetime has expired.

v2.23.0 | Report a Bug | By Email