Re: [netmod] 6021 ipv4-prefix

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Thu, 18 April 2019 11:12 UTC

Return-Path: <j.schoenwaelder@jacobs-university.de>
X-Original-To: netmod@ietfa.amsl.com
Delivered-To: netmod@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E36C51200A0 for <netmod@ietfa.amsl.com>; Thu, 18 Apr 2019 04:12:46 -0700 (PDT)
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, RCVD_IN_DNSWL_NONE=-0.0001] autolearn=ham autolearn_force=no
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 RtgMZvcZzrsa for <netmod@ietfa.amsl.com>; Thu, 18 Apr 2019 04:12:44 -0700 (PDT)
Received: from atlas5.jacobs-university.de (atlas5.jacobs-university.de [212.201.44.20]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4419F12009C for <netmod@ietf.org>; Thu, 18 Apr 2019 04:12:44 -0700 (PDT)
Received: from localhost (demetrius5.irc-it.jacobs-university.de [10.70.0.222]) by atlas5.jacobs-university.de (Postfix) with ESMTP id D7FC0D24; Thu, 18 Apr 2019 13:12:42 +0200 (CEST)
X-Virus-Scanned: amavisd-new at jacobs-university.de
Received: from atlas5.jacobs-university.de ([10.70.0.217]) by localhost (demetrius5.jacobs-university.de [10.70.0.222]) (amavisd-new, port 10032) with ESMTP id 8mY7IpLiQp7o; Thu, 18 Apr 2019 13:12:42 +0200 (CEST)
Received: from hermes.jacobs-university.de (hermes.jacobs-university.de [212.201.44.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "hermes.jacobs-university.de", Issuer "Jacobs University CA - G01" (verified OK)) by atlas5.jacobs-university.de (Postfix) with ESMTPS; Thu, 18 Apr 2019 13:12:42 +0200 (CEST)
Received: from localhost (demetrius5.irc-it.jacobs-university.de [10.70.0.222]) by hermes.jacobs-university.de (Postfix) with ESMTP id 98166200CB; Thu, 18 Apr 2019 13:12:42 +0200 (CEST)
X-Virus-Scanned: amavisd-new at jacobs-university.de
Received: from hermes.jacobs-university.de ([212.201.44.23]) by localhost (demetrius5.jacobs-university.de [10.70.0.222]) (amavisd-new, port 10028) with ESMTP id SRd2gPApa2Nm; Thu, 18 Apr 2019 13:12:42 +0200 (CEST)
Received: from exchange.jacobs-university.de (sxchmb04.jacobs.jacobs-university.de [10.70.0.156]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "exchange.jacobs-university.de", Issuer "DFN-Verein Global Issuing CA" (verified OK)) by hermes.jacobs-university.de (Postfix) with ESMTPS id 597DA200CA; Thu, 18 Apr 2019 13:12:42 +0200 (CEST)
Received: from anna.localdomain (10.50.218.117) by sxchmb03.jacobs.jacobs-university.de (10.70.0.155) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.1713.5; Thu, 18 Apr 2019 13:12:41 +0200
Received: by anna.localdomain (Postfix, from userid 501) id 8618D300865CA5; Thu, 18 Apr 2019 13:12:41 +0200 (CEST)
Date: Thu, 18 Apr 2019 13:12:41 +0200
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: Mikael Abrahamsson <swmike@swm.pp.se>
CC: <netmod@ietf.org>
Message-ID: <20190418111241.5csf5kkgwgxwtsnm@anna.jacobs.jacobs-university.de>
Reply-To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
Mail-Followup-To: Mikael Abrahamsson <swmike@swm.pp.se>, netmod@ietf.org
References: <003301d4f498$4f593640$ee0ba2c0$@gmail.com> <alpine.DEB.2.20.1904180906360.3490@uplift.swm.pp.se> <20190418080643.gcdi5x4dtn64adwc@anna.jacobs.jacobs-university.de> <alpine.DEB.2.20.1904181128480.3490@uplift.swm.pp.se> <20190418102604.y5wyqflcudiywj2i@anna.jacobs.jacobs-university.de> <alpine.DEB.2.20.1904181251000.3490@uplift.swm.pp.se>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Disposition: inline
In-Reply-To: <alpine.DEB.2.20.1904181251000.3490@uplift.swm.pp.se>
User-Agent: NeoMutt/20180716
X-ClientProxiedBy: SXCHMB03.jacobs.jacobs-university.de (10.70.0.155) To sxchmb03.jacobs.jacobs-university.de (10.70.0.155)
Archived-At: <https://mailarchive.ietf.org/arch/msg/netmod/ggUB_jL0gPJo8KpVynstWSqkltM>
Subject: Re: [netmod] 6021 ipv4-prefix
X-BeenThere: netmod@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: NETMOD WG list <netmod.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/netmod>, <mailto:netmod-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/netmod/>
List-Post: <mailto:netmod@ietf.org>
List-Help: <mailto:netmod-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/netmod>, <mailto:netmod-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 18 Apr 2019 11:12:47 -0000

On Thu, Apr 18, 2019 at 12:53:22PM +0200, Mikael Abrahamsson wrote:
> On Thu, 18 Apr 2019, Juergen Schoenwaelder wrote:
> 
> > On Thu, Apr 18, 2019 at 11:43:05AM +0200, Mikael Abrahamsson wrote:
> > 
> > > 2001:db8::/64 and 2001:db8::1/64 are NOT the same if you use them.
> > 
> > Why are they not the same if you define a prefix?
> 
> Because they're not. One of them is a valid prefix, the other one isn't.

Well, this has gone twice through WG last call and twice through IESG
review plus several directorate reviews. In the canonical format, the
non-prefix bits are all zero. I fail to see why this is now a problem.

> > +17.4 is not an integer, so this is an error (not because of the + but
> > because of the . followed by additional digits). +17 is I think a valid
> > integer value but the + will be dropped in the canonical representation.
> 
> Yes, but 2001:db8::1/64 isn't valid prefix (because the host portion of the
> prefix isn't 0) so why should it be "rounded" when 17.4 shouldn't be rounded
> if an integer input is expected?

The non-prefix bits are irrelevant for the prefix and the canonical
format has the non-prefix bits all set to zero. I understand that you
prefer 2001:db8::1/64 to be an error but RFC 6021 and RFC 6991
consider this as valid input that can be safely interpreted to mean
2001:db8::0/64.

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
Fax:   +49 421 200 3103         <https://www.jacobs-university.de/>