Re: [v6ops] [dhcwg] IPv6-Only Preferred DHCPv4 option

Ted Lemon <mellon@fugue.com> Mon, 09 December 2019 13:50 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 3F71F1201EA for <v6ops@ietfa.amsl.com>; Mon, 9 Dec 2019 05:50:57 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.9
X-Spam-Level:
X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=unavailable 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 096rKM3q0Pxd for <v6ops@ietfa.amsl.com>; Mon, 9 Dec 2019 05:50:55 -0800 (PST)
Received: from mail-pg1-x529.google.com (mail-pg1-x529.google.com [IPv6:2607:f8b0:4864:20::529]) (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 242FE1200C4 for <v6ops@ietf.org>; Mon, 9 Dec 2019 05:50:55 -0800 (PST)
Received: by mail-pg1-x529.google.com with SMTP id b9so6755283pgk.12 for <v6ops@ietf.org>; Mon, 09 Dec 2019 05:50:55 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fugue-com.20150623.gappssmtp.com; s=20150623; h=content-transfer-encoding:from:mime-version:subject:date:message-id :references:cc:in-reply-to:to; bh=fldyxeD5Q1iHjGv3Mf7II91ofVjfDE/nHo+gh0j4AII=; b=Pm1Eebp37cE7bQklsllKf2yPQADeOYZDz759inczzV+8wj+DKzHLUOFjYlMovWYPL9 Ewog2iZ4nPuaqx/NZWgsFrgXiIoqyeHLwfuoWT+Ftbmw1iEvEpS18RIy4BnV/w0l04Qo Gn8zk4FWeWIuIgo5LpX4x/77PBbMd6ojywGkQpnnl56PajPS2+qDetoy+sqEXK+vrwWt 1o5w3jfi/QBdMrqWfCYTMvbrELFaer6QFlpOjHLODAARVNshONeLGv1PFqLA5HTrdemr YYD9D/xlq9YGvRuYZhCLIJgbwqJNRNystuG1D7eKHcLFQl35bDOugIJETx6g8wC0LAhE wDlQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:content-transfer-encoding:from:mime-version :subject:date:message-id:references:cc:in-reply-to:to; bh=fldyxeD5Q1iHjGv3Mf7II91ofVjfDE/nHo+gh0j4AII=; b=FG+3Qps8isVLAt88r/vm3h+8rcpSDrlOd6xtEIygfJgJYoh6J5TpXoDYVbpuft0eWC ZVv07yNorh89h1HRMu+dRo/KRswKalUp/c4AuJnRWdI7Dse1ixfZsKY/QbGQ20lh80Uh hzvRVSrnDiXUQS1VmGwGg3DcH/P+zULrTii3MFigc2vLnWengGR/NRE0pkJdJVRKby1d lSf+hfyRmnCuvo6i6NvRE5TqktizzIjSx+uFKMNFSfph2oR1GB0Yo2oZCN4CeB406per BGEhFvQZ99MZgMODs0+5a57go8NBlRmvDXiEaRH1GzJCgXNeXjaEt1HARsURrcFexlTA VL2Q==
X-Gm-Message-State: APjAAAWpV8nsI3itt8Zg0QNT0rDGrP9Ur3PoMHYflSV4lIXhOvru6wEX ylUK1L1KhTEmT7HEX0vAcjdQ7A==
X-Google-Smtp-Source: APXvYqx8PZyyrCLZmDXqDJQUl1jhF5zhD5g/9FU+xIZSENsXv1JsFdgZD+YejOk2PpJhpvL50c0Wzw==
X-Received: by 2002:a65:4344:: with SMTP id k4mr18450709pgq.193.1575899454619; Mon, 09 Dec 2019 05:50:54 -0800 (PST)
Received: from ?IPv6:2600:380:856c:cbd0:f4d8:4261:16a2:288f? ([2600:380:856c:cbd0:f4d8:4261:16a2:288f]) by smtp.gmail.com with ESMTPSA id j18sm25153262pgk.1.2019.12.09.05.50.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 09 Dec 2019 05:50:53 -0800 (PST)
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
From: Ted Lemon <mellon@fugue.com>
Mime-Version: 1.0 (1.0)
Date: Mon, 09 Dec 2019 05:50:52 -0800
Message-Id: <40C5B176-F2F4-491F-B6F6-6410A93A04F9@fugue.com>
References: <CAKD1Yr0R70H=_x3UqtmNWDqWFZLrOEmzFZaJPH7QLLE30XxF4Q@mail.gmail.com>
Cc: Jen Linkova <furry13@gmail.com>, V6 Ops List <v6ops@ietf.org>, "draft-link-dhc-v6only@ietf.org" <draft-link-dhc-v6only@ietf.org>, Michael Richardson <mcr+ietf@sandelman.ca>, "dhcwg@ietf.org" <dhcwg@ietf.org>
In-Reply-To: <CAKD1Yr0R70H=_x3UqtmNWDqWFZLrOEmzFZaJPH7QLLE30XxF4Q@mail.gmail.com>
To: Lorenzo Colitti <lorenzo=40google.com@dmarc.ietf.org>
X-Mailer: iPhone Mail (17E180a)
Archived-At: <https://mailarchive.ietf.org/arch/msg/v6ops/ZDEFXT7lUQVhqoWwX5qEPUZvqGE>
Subject: Re: [v6ops] [dhcwg] 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: Mon, 09 Dec 2019 13:50:57 -0000

If we return the option, that should be enough. 

> On Dec 8, 2019, at 22:03, Lorenzo Colitti <lorenzo=40google.com@dmarc.ietf.org> wrote:
> 
> In that sense I think b) is a non-starter, and I don't think c) is feasible either: we do need to return something to the client, otherwise it can't know that IPv6-only will work, and I don't think there's anything other than OFFER that the server respond with (I don't think NAK is typically sent in response to DISCOVER).