Re: Fwd: New Version Notification for draft-mishra-6man-variable-slaac-02.txt

Alexandre Petrescu <alexandre.petrescu@gmail.com> Mon, 22 February 2021 14:50 UTC

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Subject: Re: Fwd: New Version Notification for draft-mishra-6man-variable-slaac-02.txt
To: ipv6@ietf.org
References: <161400396002.10207.237254660863849144@ietfa.amsl.com> <284e7e79-65a8-0523-b32c-dc2019df73ad@gmail.com>
From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Date: Mon, 22 Feb 2021 15:48:50 +0100
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For information, with respect to implementation:

- it is known that OpenBSD implements a form of Variable SLAAC in that
   allows Hosts to form addresses using SLAAC with prefixes different
   than 64.

- for FreeBSD: a co-author submitted a bug report, that I agree with.
   See https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253005

- for linux, there is an open source implementation that has been
   submitted for consideration to the mainline kernel. As of Nov. 2020 it
   was this:
   https://github.com/dmytroshytyi/variable-slaac/releases/tag/2.0.3

Alex


Le 22/02/2021 à 15:39, Alexandre Petrescu a écrit :
> Hi,
> 
> With co-authors we updated the implementation, the draft, and re-submitted.
> 
> This new version takes into account comments from linux implementers
> that were expressed on this email list.
> 
> - removed the flag from the RA.
> - added a parameter local to the Host (a sysctl in linux) which is off
>    by default, thus respecting the 64bit boundary of RFC4291.  When the
>    parameter is set the Host is allowed to form addresses out of prefixes
>    whose lengths is different than 64.
> - stressed that a race to the bottom should be avoided.
> - other small text improvements.
> 
> Please have a look at the draft.  We are interested to hear
> comments?
> 
> https://datatracker.ietf.org/doc/html/draft-mishra-6man-variable-slaac
> 
> (and yes, I do remember that during last IETF one of the ideas discussed
> for moving forward was a potential new lightweight protocol designed to
> do prefix delegation with ND messages.  And no, this draft does not
> advance on that particular idea; I can explain why separately if 
> necessary.)
> 
> Alex
> 
> 
> -------- Message transféré --------
> Sujet : New Version Notification for 
> draft-mishra-6man-variable-slaac-02.txt
> Date : Mon, 22 Feb 2021 06:26:00 -0800
> De : internet-drafts@ietf.org
> Pour : Alexandre Petrescu <Alexandre.Petrescu@cea.fr>fr>, Alexandre
> Petrescu <alexandre.petrescu@cea.fr>fr>, Dmytro Shytyi
> <dmytro.shytyi@sfr.com>om>, Dusan Mudric <dmudric@ciena.com>om>, Gyan Mishra
> <gyan.s.mishra@verizon.com>om>, Naveen Kottapalli <nkottapalli@benu.net>
> 
> 
> A new version of I-D, draft-mishra-6man-variable-slaac-02.txt
> has been successfully submitted by Alexandre Petrescu and posted to the
> IETF repository.
> 
> Name:        draft-mishra-6man-variable-slaac
> Revision:    02
> Title:        SLAAC with prefixes of arbitrary length in PIO (Variable 
> SLAAC)
> Document date:    2021-02-22
> Group:        Individual Submission
> Pages:        31
> URL:
> https://www.ietf.org/archive/id/draft-mishra-6man-variable-slaac-02.txt
> Status:
> https://datatracker.ietf.org/doc/draft-mishra-6man-variable-slaac/
> Htmlized:
> https://datatracker.ietf.org/doc/html/draft-mishra-6man-variable-slaac
> Htmlized:
> https://tools.ietf.org/html/draft-mishra-6man-variable-slaac-02
> Diff:
> https://www.ietf.org/rfcdiff?url2=draft-mishra-6man-variable-slaac-02
> 
> Abstract:
>     This draft proposes the use of arbitrary length prefixes in PIO for
>     SLAAC.  A prefix of length 63 in PIO, for example, would be permitted
>     to form an address whose interface identifier length is 65, which
>     allows several benefits.  A prefix of length 65 would be allowed too,
>     but it SHOULD NOT be used on a large scale, like at a large ISP; this
>     is to avoid a race to the bottom.
> 
>     The implementation uses a parameter in the Host which is off by
>     default.  In that case, the Host respects the 64bit boundary.  When
>     the parameter is set to on the Host accepts prefixes of lengths
>     different than 64 and forms 128bit addresses.
> 
>     In the past, various IPv6 addressing models have been proposed based
>     on a subnet hierarchy embedding a 64-bit prefix.  The last remnant of
>     IPv6 classful addressing is a inflexible interface identifier
>     boundary at /64.  This document proposes flexibility to the fixed
>     position of that boundary for interface addressing.
> 
> 
> 
> 
> Please note that it may take a couple of minutes from the time of 
> submission
> until the htmlized version and diff are available at tools.ietf.org.
> 
> The IETF Secretariat
> 
> 
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