Re: [apps-discuss] I-D Action: draft-ietf-appsawg-rfc5451bis-02.txt

"Murray S. Kucherawy" <superuser@gmail.com> Sun, 19 May 2013 14:52 UTC

Return-Path: <superuser@gmail.com>
X-Original-To: apps-discuss@ietfa.amsl.com
Delivered-To: apps-discuss@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2E2AC21F889C for <apps-discuss@ietfa.amsl.com>; Sun, 19 May 2013 07:52:21 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.434
X-Spam-Level:
X-Spam-Status: No, score=-2.434 tagged_above=-999 required=5 tests=[AWL=0.165, BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001]
Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HfFlgtgKvkvg for <apps-discuss@ietfa.amsl.com>; Sun, 19 May 2013 07:52:20 -0700 (PDT)
Received: from mail-wi0-x234.google.com (mail-wi0-x234.google.com [IPv6:2a00:1450:400c:c05::234]) by ietfa.amsl.com (Postfix) with ESMTP id BD41621F888F for <apps-discuss@ietf.org>; Sun, 19 May 2013 07:52:19 -0700 (PDT)
Received: by mail-wi0-f180.google.com with SMTP id hn14so1442681wib.7 for <apps-discuss@ietf.org>; Sun, 19 May 2013 07:52:18 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=WI3qIgSNOPWSdVAGMQqIQGx+QKT5AIfNJplbcGqsG+0=; b=aNc1RplLsGKr0B/xOjlSTJ0jeGB1kBwTU5fEt7Lai20a4riN4/mdyGdt78ljDkIdVY kazwYskrQG+vl5Vp651kpVQ1JtDMlbf2/T6PFx8o04ZY1gb1/VkOHL0fGfbaWBEgDz06 mJ0mArpyiqDPV4oOBul+WHj6ICXH9TPiputDgbgtcHt7d3rVp18MzO2PxxCc7Aj+DSwK jmnf47V5lNFQt9lHZ4VuNghVYmky/TLWZII60la6ciLAtZQ4ox8OVAbMk6oC2mwOBN3x ph7FE2Fqvcr07ATh9qFF5ytsqIR0S5cITbsxIC8LhT8fbtYl45sesGmm79ZGQG5Gzjtm WvlA==
MIME-Version: 1.0
X-Received: by 10.180.210.242 with SMTP id mx18mr6071197wic.14.1368975138777; Sun, 19 May 2013 07:52:18 -0700 (PDT)
Received: by 10.180.14.34 with HTTP; Sun, 19 May 2013 07:52:18 -0700 (PDT)
In-Reply-To: <20130519052116.75996.qmail@joyce.lan>
References: <CAL0qLwZuMOky2rLBm4UYhgNJmyXaPyO25WhBGrrgK4DUKcAWqg@mail.gmail.com> <20130519052116.75996.qmail@joyce.lan>
Date: Sun, 19 May 2013 07:52:18 -0700
Message-ID: <CAL0qLwaDwgyKH4DV=s9djw2pf7ULHPzbDn8Unhd_rJLbMaMd1Q@mail.gmail.com>
From: "Murray S. Kucherawy" <superuser@gmail.com>
To: John Levine <johnl@taugh.com>
Content-Type: multipart/alternative; boundary=001a11c262e8da724b04dd135c0e
Cc: IETF Apps Discuss <apps-discuss@ietf.org>
Subject: Re: [apps-discuss] I-D Action: draft-ietf-appsawg-rfc5451bis-02.txt
X-BeenThere: apps-discuss@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: General discussion of application-layer protocols <apps-discuss.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/apps-discuss>, <mailto:apps-discuss-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/apps-discuss>
List-Post: <mailto:apps-discuss@ietf.org>
List-Help: <mailto:apps-discuss-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/apps-discuss>, <mailto:apps-discuss-request@ietf.org?subject=subscribe>
X-List-Received-Date: Sun, 19 May 2013 14:52:21 -0000

On Sat, May 18, 2013 at 10:21 PM, John Levine <johnl@taugh.com> wrote:

> >version alone.  Although you're correct that strictly speaking it's
> >incompatible, it only affects consumers regarding a currently unused
> >protocol feature.
>
> Hmmn.  Let's say I have a mail server farm generating 5451 A-R headers
> and the guy down the hall has a filtering/sorting/delivering farm
> interpreting them.  Then someone shows up with 5451bis. I am a good
> doobie and update my software to comply with 5451bis which, since I am
> only using authentication schemes described in 5451, merely involves
> adding /1 after the authserv-id.  I hear the sound of screaming from
> the other end of the hall as the unexpected slash breaks the
> filtering.
>

You don't have to change anything in a generator to remain compliant.  The
"/1" is optional if the version number isn't actually changing.

-MSK