Re: [v6ops] Stateful SLAAC (draft-ietf-v6ops-unique-ipv6-prefix-per-host)

DY Kim <dykim6@gmail.com> Sat, 11 November 2017 02:29 UTC

Return-Path: <dykim6@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 BCE26128D2E; Fri, 10 Nov 2017 18:29:34 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.749
X-Spam-Level:
X-Spam-Status: No, score=-1.749 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=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 t-9LwZPvGPVK; Fri, 10 Nov 2017 18:29:33 -0800 (PST)
Received: from mail-pf0-x243.google.com (mail-pf0-x243.google.com [IPv6:2607:f8b0:400e:c00::243]) (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 B21EB1200C1; Fri, 10 Nov 2017 18:29:33 -0800 (PST)
Received: by mail-pf0-x243.google.com with SMTP id d28so7940848pfe.2; Fri, 10 Nov 2017 18:29:33 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=Leok4TIErQLKjfzoA5Oo91umP/ZT0UnvgKZSiBLikHY=; b=ID3qIHRmkrs9Wctt4tbMacc+xLAeqtYlWnK/j2KITFxF5qirO6+sT2zMVMbgffsOje 5F6GhqNuQrfv4sqp/6Mv4wH514yvrAEe13JqGBQ+nso5L8g38Ps/za9HFsfychNBS2hR wFdoKPC+82mGG0Y3OoW5mAEyqcWUJGCE5u6NfsTgRqTxrHZJcNgrTsJzlSPoJf8pw1l7 kf4VggL7Qzi3+iCZ9JSW5rbVfdwsdE7Yw0huuDeqE2qcX4vyX0+8D7VaZ6QTv7VjMwPB U58z3fZYtcR/GboH337EC20OPA/r/6YaB4HexSKVuzk6C2Vx4ZJkM3WYdTUt0IN36eN0 U5xQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=Leok4TIErQLKjfzoA5Oo91umP/ZT0UnvgKZSiBLikHY=; b=bUgLY0BH+OFACK29X38sGNoIZGSXTxigg6j5gzADELxOGZwRympy9euEtJB2yB6gfs 7oz7GNrzv0vq7rXCJ+jgrqWgG5l+/5KDiZtIYiKu0TFKMc3sDy3H4vPst4MNIa9JqD/I j9jltymMr+kfEaK8b+w6CguVcExhgfdp00CLQ4BHd3LXqChiU3B3IKDimtH1jhWiH/3/ uCsKVrA1RLFDubGpLPcGHddVcQjqTKRFysPPsWvetPBjl4sByUBgQW489ZpUFRdcR8X6 BtthL1QRFaCdqb6fdJ7YruyMHA2rq2OjJ/jZYaf7Msh0Z/5xKyNW6oolBdizJH7eewab tbVA==
X-Gm-Message-State: AJaThX451Ct+J3vn5NmW0C3nCERTujQg/rKrAenQowyXmR+7HF1kOsVM VT6J8Px0p9Vi9fyZO4J6lrk=
X-Google-Smtp-Source: AGs4zMaDiYQTqzGW1mmamW7VkjVV1d9jiqo8iVTrOalLHN9kkJ7jfKWx7vj4HHotcH6x25nrEe+afQ==
X-Received: by 10.84.128.227 with SMTP id a90mr2375804pla.224.1510367373107; Fri, 10 Nov 2017 18:29:33 -0800 (PST)
Received: from [59.29.43.171] ([59.29.43.171]) by smtp.gmail.com with ESMTPSA id q73sm23918570pfl.146.2017.11.10.18.29.28 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 10 Nov 2017 18:29:30 -0800 (PST)
Content-Type: text/plain; charset="utf-8"
Mime-Version: 1.0 (Mac OS X Mail 11.1 \(3445.4.7\))
Subject: Re: [v6ops] Stateful SLAAC (draft-ietf-v6ops-unique-ipv6-prefix-per-host)
From: DY Kim <dykim6@gmail.com>
In-Reply-To: <37b58331-ecfc-aaf8-bde4-91dd4d375834@si6networks.com>
Date: Sat, 11 Nov 2017 11:29:26 +0900
Cc: Fred Baker <fredbaker.ietf@gmail.com>, Lorenzo Colitti <lorenzo@google.com>, IPv6 Operations <v6ops@ietf.org>, "6man@ietf.org" <6man@ietf.org>, "6man-ads@tools.ietf.org" <6man-ads@ietf.org>, "v6ops-ads@ietf.org" <v6ops-ads@ietf.org>, draft-ietf-v6ops-unique-ipv6-prefix-per-host@tools.ietf.org
Content-Transfer-Encoding: quoted-printable
Message-Id: <029B5A33-0C3F-4021-BA86-50E6DF37F879@gmail.com>
References: <be9724f5-2ff5-d90c-2749-ecae2c628b78@si6networks.com> <CAKD1Yr0_a2Qm8U4oK+BQU57DeDUD9i-o_+G+YhnH4pVXRxmxxQ@mail.gmail.com> <BBB987EF-D91C-4FD1-9084-21382F24E7BF@gmail.com> <37b58331-ecfc-aaf8-bde4-91dd4d375834@si6networks.com>
To: Fernando Gont <fgont@si6networks.com>
X-Mailer: Apple Mail (2.3445.4.7)
Archived-At: <https://mailarchive.ietf.org/arch/msg/ipv6/JHL7xZiXf3wtZcy6fGBLDeKmWIM>
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, 11 Nov 2017 02:29:35 -0000

I don’t get it when you say this doc makes SLAAC stateful.

‘Staleless’ in SLAAC applies to hosts, not necessarily to routers.

Your argument might be based on the text of the draft, 2nd last para of Sec. 5:

  "IPv6 SLAAC requires the router to maintain neighbor state, which implies costs in terms of memory, power, message exchanges, and message processing."

For routers to keep (address) information about the hosts does not make SLAAC stateful. In order to manage (keep track of) the hosts that use SLAAC, routers need to store some information about the host. This action of the router is natural and has nothing to to with the ‘stateless’ property of SLAAC, AFAIU.

See also, for example, the beginning of the 2nd para of Sec. 1, RFC 4862:

  "The IPv6 stateless autoconfiguration mechanism requires no manual configuration of hosts, minimal (if any) configuration of routers, and no additional servers.”

I don’t think the text in Sec. 5 of the doc, as repeated above, does not make SLAAC stateful.

---
DY


> On 11 Nov 2017, at 05:23, Fernando Gont <fgont@si6networks.com> wrote:
> 
> THe main issue is not this but, as the subject implies, this document
> making SLAAC stateful.