Re: [v6ops] IPv6-Only Preferred DHCPv4 option

Ted Lemon <mellon@fugue.com> Wed, 04 December 2019 20:44 UTC

Return-Path: <mellon@fugue.com>
X-Original-To: v6ops@ietfa.amsl.com
Delivered-To: v6ops@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 943DF120895 for <v6ops@ietfa.amsl.com>; Wed, 4 Dec 2019 12:44:57 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.898
X-Spam-Level:
X-Spam-Status: No, score=-1.898 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, 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=fugue-com.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 U-D5E6jhCxiJ for <v6ops@ietfa.amsl.com>; Wed, 4 Dec 2019 12:44:55 -0800 (PST)
Received: from mail-pg1-x535.google.com (mail-pg1-x535.google.com [IPv6:2607:f8b0:4864:20::535]) (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 912881200A3 for <v6ops@ietf.org>; Wed, 4 Dec 2019 12:44:55 -0800 (PST)
Received: by mail-pg1-x535.google.com with SMTP id x7so405393pgl.11 for <v6ops@ietf.org>; Wed, 04 Dec 2019 12:44:55 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fugue-com.20150623.gappssmtp.com; s=20150623; h=from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=E+GWXATTZCgUc3aSrrx/4orwGRaahQ3VXqO+J1RRil0=; b=WDe6nBgd+rSw69yKTYGqBKcTfHL3l3mDhWOXvjkh6gu0YwPEyDruh33DEyr1JBvIEV VqvM3PZwq2fS6VyyaIL66iW4Ax+cg5HSkzALtuI1JlTLIMxjlT3IvTli3ySKgc42j6FL 0m2AAnsAENrqQJG26kKjPddUREEpG0VPPAcfBahxx3pAzeebbKM79T4F8iTpUvvWhPy0 s6s1fGjh1mSCIcVkpRn8pCT2+HLghz+hS+stZT0wrwNyjhfeuoyIj3uqhnjlXcWuUrUz 5ViEEWbh79T9VlSog39Bw7K+3ENYzDXF4D6BSqxz8x5I+5eq+BU7+Xsgx3yHG/LskKet Sj4Q==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:message-id:mime-version:subject:date :in-reply-to:cc:to:references; bh=E+GWXATTZCgUc3aSrrx/4orwGRaahQ3VXqO+J1RRil0=; b=ZiBP6Tli71oLMDKPtw823VhC7rx1kIMBUc6Ia7aBOmN7/lWtqx9V9CIgwlimraTUiG DxV98kT92Z84ISHk5u9mYCNHkaUO3ilkAuBiJUcYAjSyMvRzsvrKUicTNXeV0s4GTKf1 2W8OyYjcSB+rScqZ5Y/iN7PwFqYQJjAYJmCwNkPQ1BqKWwByIncE0jjBBklD4wkIQOZ6 MdodrqynK40K+LrcsS/M5IZMwxKk7sbR3gZhgJ6XWNnXmaosIr9452LlLmurr3EtmnD2 dLOGZVaXbJmZtSYnvPFs+uww+lLTiuy0cjunlni3rJJyuvAu+cpM7p+AKFO4sV2x9jSp IKbA==
X-Gm-Message-State: APjAAAUAqzQLTtDFfvg+zefdXP8Gpcom7em/BpJiIrkNlZ9IYYn4JFgl DJm7jZPgSUkya1NXvT6yIkU8WQ==
X-Google-Smtp-Source: APXvYqy+YpuwTe1N6dqK9YtV6uQ1JgzL8sRVflamBrIS2DifLPn4ZNt/EmO+p8XSL7FtcHL/IEBBYQ==
X-Received: by 2002:a62:447:: with SMTP id 68mr5427604pfe.70.1575492294832; Wed, 04 Dec 2019 12:44:54 -0800 (PST)
Received: from encantada.scv.apple.com ([17.192.138.54]) by smtp.gmail.com with ESMTPSA id t8sm9875213pfq.92.2019.12.04.12.44.53 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 04 Dec 2019 12:44:54 -0800 (PST)
From: Ted Lemon <mellon@fugue.com>
Message-Id: <446BE15A-16D3-4F7A-9508-3AAAB2D95FE0@fugue.com>
Content-Type: multipart/alternative; boundary="Apple-Mail=_F78374D2-B8A8-4E60-8176-8E19FB7A0795"
Mime-Version: 1.0 (Mac OS X Mail 13.0 \(3600\))
Date: Wed, 04 Dec 2019 12:44:52 -0800
In-Reply-To: <9bd73ee1-46f7-5084-06a6-59c7b391f9cb@foobar.org>
Cc: Brian E Carpenter <brian.e.carpenter@gmail.com>, v6ops@ietf.org
To: Nick Hilliard <nick@foobar.org>
References: <CAFU7BAR1JLUZps=CAqJfeQtUf-xQ88RYvgYrPCP+QP0Ter7YFg@mail.gmail.com> <E03BBE6C-3BED-4D49-8F79-0A1B313EFD9D@apple.com> <28594.1575483729@localhost> <7ac18a46-31d9-74cc-117a-0fd908413aac@gmail.com> <9bd73ee1-46f7-5084-06a6-59c7b391f9cb@foobar.org>
X-Mailer: Apple Mail (2.3600)
Archived-At: <https://mailarchive.ietf.org/arch/msg/v6ops/lUZ8jGVFoLou1P2I6mOmJO93FSc>
Subject: Re: [v6ops] IPv6-Only Preferred DHCPv4 option
X-BeenThere: v6ops@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: v6ops discussion list <v6ops.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/v6ops>, <mailto:v6ops-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/v6ops/>
List-Post: <mailto:v6ops@ietf.org>
List-Help: <mailto:v6ops-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/v6ops>, <mailto:v6ops-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 04 Dec 2019 20:44:58 -0000

On Dec 4, 2019, at 12:43 PM, Nick Hilliard <nick@foobar.org> wrote:
> approach is better than the other way around :-)

Because once the device knows it’s on an IPv6-only network, it doesn’t have to keep trying to get an IPv4 lease, and we don’t have to deal with the problem of it getting a lease before it gets an answer from DHCPv6 or RA and then having running connections that would be killed.