Re: A proposal for draft-ietf-6man-rfc4291bis-07

Iván Arce <iarce@fundacionsadosky.org.ar> Fri, 03 March 2017 19:43 UTC

Return-Path: <iarce@fundacionsadosky.org.ar>
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 6FDF11295E8 for <ipv6@ietfa.amsl.com>; Fri, 3 Mar 2017 11:43:07 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.7
X-Spam-Level:
X-Spam-Status: No, score=-2.7 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=fundacionsadosky.org.ar
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 R1gC35AktHlJ for <ipv6@ietfa.amsl.com>; Fri, 3 Mar 2017 11:43:05 -0800 (PST)
Received: from mail-qk0-x229.google.com (mail-qk0-x229.google.com [IPv6:2607:f8b0:400d:c09::229]) (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 35CF4129593 for <ipv6@ietf.org>; Fri, 3 Mar 2017 11:43:05 -0800 (PST)
Received: by mail-qk0-x229.google.com with SMTP id 1so74048025qkl.3 for <ipv6@ietf.org>; Fri, 03 Mar 2017 11:43:05 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fundacionsadosky.org.ar; s=google; h=subject:references:from:to:organization:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding; bh=ugXKDjyeG9jiOZLtCI77qKOHF0mA2/HQO9mlZst4IQ4=; b=CxjIlJJznV2s4PDfSs8eb2KC/jDtTPKvfERc5wyQzXClyTD4tVFu4qYDudMt8IrLWA zbO7m0wgClf1ZZRaL2PrryC5h25icJMVaMYshP5EhuHN+N8e9RRtYl2hzcA3c/wLE/LF Y7qi0KfszQmiUsnTh1yxoWBtauTM01dmuOvo4=
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:references:from:to:organization :message-id:date:user-agent:mime-version:in-reply-to :content-transfer-encoding; bh=ugXKDjyeG9jiOZLtCI77qKOHF0mA2/HQO9mlZst4IQ4=; b=FfbdIfFrY5VMIsHY1zDl5JmPWREPRSuoJb2V+su4diA+OG51Nifpbn/4c2cR80IPT6 zxhoT7chR+IEzSxV5syoBQsA2DcXqwbA0CLy18bPDdZuQST5qe9Zw1k4G9tHvopWiCyY G/bIP0UppuBXanTvgPhDXvY2C7jg6fFcOeizwDhdp3w/yfllDPhIdPQCJ/nHg2eHKc4A PzlETz77z9hL2YBWDzltnDUk9jh/t9BIMEQwTuTuaR6+V4XvK7qE+V1tGjIhv+XK/kXH P2Vx927Kned2cD63Wr/PwSnTO4wdYw4ZvveGPobov6heuh0z2v91GqmP1c9gyC6WIn2S d1tw==
X-Gm-Message-State: AMke39mYBYHhnf0O1MbxO/FOVeM9PbgEJgtX3Rb89Ig9gVM/SjLECL/YZrCWgaPzaUN/yQ==
X-Received: by 10.237.63.39 with SMTP id p36mr4151790qtf.187.1488570183983; Fri, 03 Mar 2017 11:43:03 -0800 (PST)
Received: from [192.168.100.103] ([186.158.218.178]) by smtp.googlemail.com with ESMTPSA id 29sm8228147qtn.51.2017.03.03.11.43.02 for <ipv6@ietf.org> (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 03 Mar 2017 11:43:02 -0800 (PST)
Subject: Re: A proposal for draft-ietf-6man-rfc4291bis-07
References: <CAN-Dau17q_BrUuzfvB1mLDt6p5UxYikphWaHpa8VQ2L-3kx-DA@mail.gmail.com> <a484b60f9d9b4fcea24dc320c550da2c@XCH15-06-11.nw.nos.boeing.com> <CAN-Dau3ZfYjQ1sgHM96pbECtzNtXnTkCeOWUk_kagjGSohVE5A@mail.gmail.com>
From: =?UTF-8?Q?Iv=c3=a1n_Arce?= <iarce@fundacionsadosky.org.ar>
To: 6man WG <ipv6@ietf.org>
Organization: =?UTF-8?Q?Fundaci=c3=b3n_Dr._Manuel_Sadosky?=
Message-ID: <8a23ae5e-1d75-4fa7-0be0-461d0d456c94@fundacionsadosky.org.ar>
Date: Fri, 3 Mar 2017 16:43:00 -0300
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0 Lightning/4.7.7
MIME-Version: 1.0
In-Reply-To: <CAN-Dau3ZfYjQ1sgHM96pbECtzNtXnTkCeOWUk_kagjGSohVE5A@mail.gmail.com>
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: 8bit
Archived-At: <https://mailarchive.ietf.org/arch/msg/ipv6/5tAZg1WA0nyNjcgnYblv0bUVQsU>
X-BeenThere: ipv6@ietf.org
X-Mailman-Version: 2.1.17
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: Fri, 03 Mar 2017 19:43:07 -0000

Hello

El 2/3/17 a las 22:49, David Farmer escribió:
>  
> However, if a provider only delegates a /64, this new text ensures that
> prefix could be further subnetted down below /64 using manual config or
> possibly DHCPv6.  This is NOT RECOMMENDED, /64 subnets are RECOMMENDED
> and RFC6177 clearly RECOMMENDS sites be allow more than one /64 subnet.
>  
> 
>     > 3. IIDs are REQUIRED to be 64 bits
> 
>     I thought this interminable last call was specifically because many
>     of us object to this idea. With those exceptions such as SLAAC on
>     Ethernet. Or maybe IIDs should not be longer than 64 bits?
> 
> 
> Variable length IIDs are a BIG CHANGE and it will break current code,
> I'm not sure that is a really good idea.

Is there data about that? Any specifics? Which/whose code?

What is the scope of the alleged problem?

A host OS implementor (OpenBSD) had said on this list that they will NOT
accept /64 as fixed prefix len mandated in a Internet Standard.

Some people on the list say allowing variable length prefix len will
"break existing running code" while others say the exact opposite. There
can't be a rational discussion about this without actual data.

An alternative is to drop the entire discussion on the basis of a
provable argument such as "it will break existing code" and move to a
discussion where arguments for and against are just analyzed in abstract
or where personal preferences, opinions and interests are stated as such.


-ivan

-- 
Iván Arce
Director del Programa STIC
Fundación Dr. Manuel Sadosky
http://www.fundacionsadosky.org.ar
TE: (+54-11) 4328-5164
GPG fingerprint: 4D97 3003 76C9 9DA4 7209  7982 0A1D 10BE CEA9 1B6E