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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

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Date: Sun, 19 May 2013 07:52:18 -0700
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From: "Murray S. Kucherawy" <superuser@gmail.com>
To: John Levine <johnl@taugh.com>
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Cc: IETF Apps Discuss <apps-discuss@ietf.org>
Subject: Re: [apps-discuss] I-D Action: draft-ietf-appsawg-rfc5451bis-02.txt
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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

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