From owner-freebsd-net@FreeBSD.ORG  Tue Oct 17 02:40:09 2006
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
X-Original-To: freebsd-net@freebsd.org
Delivered-To: freebsd-net@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 15C5316A403
	for <freebsd-net@freebsd.org>; Tue, 17 Oct 2006 02:40:09 +0000 (UTC)
	(envelope-from jinmei@isl.rdc.toshiba.co.jp)
Received: from shuttle.wide.toshiba.co.jp (shuttle.wide.toshiba.co.jp
	[202.249.10.124])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 4E43A43D55
	for <freebsd-net@freebsd.org>; Tue, 17 Oct 2006 02:40:08 +0000 (GMT)
	(envelope-from jinmei@isl.rdc.toshiba.co.jp)
Received: from impact.jinmei.org (unknown
	[2001:200:1b1:1010:b097:da8d:93a2:25d3])
	by shuttle.wide.toshiba.co.jp (Postfix) with ESMTP
	id C0ADB15218; Tue, 17 Oct 2006 11:40:06 +0900 (JST)
Date: Tue, 17 Oct 2006 11:40:05 +0900
Message-ID: <y7vmz7vis1m.wl%jinmei@isl.rdc.toshiba.co.jp>
From: JINMEI Tatuya / =?ISO-2022-JP?B?GyRCP0BMQEMjOkgbKEI=?=
	<jinmei@isl.rdc.toshiba.co.jp>
To: "Krejsa, Dan" <dan.krejsa@windriver.com>
In-Reply-To: <F7D1E22E318B7148B9EF6345A57821D901DA861B@ALA-MAIL03.corp.ad.wrs.com>
References: <F7D1E22E318B7148B9EF6345A57821D901DA861B@ALA-MAIL03.corp.ad.wrs.com>
User-Agent: Wanderlust/2.14.0 (Africa) Emacs/21.3 Mule/5.0 (SAKAKI)
Organization: Research & Development Center, Toshiba Corp., Kawasaki, Japan.
MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka")
Content-Type: text/plain; charset=US-ASCII
Cc: freebsd-net@freebsd.org
Subject: Re: PPP IPv6 prefix length and stateless autoconfiguration?
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 17 Oct 2006 02:40:09 -0000

>>>>> On Mon, 16 Oct 2006 15:19:55 -0700, 
>>>>> "Krejsa, Dan" <dan.krejsa@windriver.com> said:

> Some code in the in6_update_ifa() function in netinet6/in6.c
> enforces that if an IPv6 destination address is specified for
> an interface address, the interface must be point-to-point or
> loopback (fine), and the corresponding prefix length must be
> exactly 128 bits.

> The latter seems (at least naively) to conflict with 
> the definition in

>   http://www.ietf.org/internet-drafts/draft-ietf-ipv6-over-ppp-v2-02.txt

> that the interface identifier length for PPP interfaces is 64 bits, and
> correspondingly prefixes accepted from a router advertisement
> must also be 64 bits long; see section 5.5.3 in

>   http://www.ietf.org/internet-drafts/draft-ietf-ipv6-rfc2462bis-08.txt

So shouldn't you simply specify the prefix length of 64 without
specifying the *destination* address of the p2p link?

					JINMEI, Tatuya
					Communication Platform Lab.
					Corporate R&D Center, Toshiba Corp.
					jinmei@isl.rdc.toshiba.co.jp