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Re: [v6ops] I-D Action: draft-ietf-v6ops-unique-ipv6-prefix-per-host-07.txt

神明達哉 <jinmei@wide.ad.jp> Thu, 17 August 2017 23:43 UTC

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From: 神明達哉 <jinmei@wide.ad.jp>
Date: Thu, 17 Aug 2017 16:43:07 -0700
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To: DY Kim <dykim6@gmail.com>
Cc: Brian E Carpenter <brian.e.carpenter@gmail.com>, Simon Hobson <linux@thehobsons.co.uk>, v6ops list <v6ops@ietf.org>
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Subject: Re: [v6ops] I-D Action: draft-ietf-v6ops-unique-ipv6-prefix-per-host-07.txt
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At Fri, 18 Aug 2017 08:27:01 +0900,
DY Kim <dykim6@gmail.com> wrote:

> SLAAC implementations faithful to the spec should have left the
> prefix length open, to be configurable/settable by the admin. If
> not, the implementations should have been declared non-conformant
> with the spec.

This is not correct.  SLAAC implementations faithful to the spec
should leave the IID length (and therefore its prefix length) open to
the underlying link-type specification (such as RFC2464).  It's not
open to be configurable/settable by the admin.

If an implementation unconditionally hardcodes a particular value such
as 64, then technically, it's non-compliant.  But as of today it's not
distinguishable from truly compliant implementations based on
externally visible behavior, since all known (at least as far as I
know) such link-type specifications use the same single constant, 64.

--
JINMEI, Tatuya

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