From owner-freebsd-net@FreeBSD.ORG  Fri Dec 10 02:50:30 2004
Return-Path: <owner-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 4C4AF16A4D0
	for <net@freebsd.org>; Fri, 10 Dec 2004 02:50:30 +0000 (GMT)
Received: from shuttle.wide.toshiba.co.jp (shuttle.wide.toshiba.co.jp
	[202.249.10.124])
	by mx1.FreeBSD.org (Postfix) with ESMTP id E302043D69
	for <net@freebsd.org>; Fri, 10 Dec 2004 02:50:29 +0000 (GMT)
	(envelope-from jinmei@isl.rdc.toshiba.co.jp)
Received: from ocean.jinmei.org (unknown
	[3ffe:501:100f:1048:5c31:4b60:a406:2638])
	by shuttle.wide.toshiba.co.jp (Postfix) with ESMTP
	id B13B915210; Fri, 10 Dec 2004 11:50:28 +0900 (JST)
Date: Fri, 10 Dec 2004 11:50:41 +0900
Message-ID: <y7v1xdyhnni.wl@ocean.jinmei.org>
From: JINMEI Tatuya / =?ISO-2022-JP?B?GyRCP0BMQEMjOkgbKEI=?=
	<jinmei@isl.rdc.toshiba.co.jp>
To: "Konstantin KABASSANOV" <Konstantin.Kabassanov@lip6.fr>
In-Reply-To: <002601c4de18$02b64ea0$8748e384@ipv6.lip6.fr>
References: <y7vu0qwgji0.wl@ocean.jinmei.org>
	 <002601c4de18$02b64ea0$8748e384@ipv6.lip6.fr>
User-Agent: Wanderlust/2.10.1 (Watching The Wheels) Emacs/21.3 Mule/5.0
	(SAKAKI)
Organization: Research & Development Center, Toshiba Corp., Kawasaki, Japan.
MIME-Version: 1.0 (generated by SEMI 1.14.5 - "Awara-Onsen")
Content-Type: text/plain; charset=US-ASCII
cc: net@freebsd.org
Subject: 
	Re: the correct ipv6 behavior for interfaces with gif tunnel on them
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.1
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: Fri, 10 Dec 2004 02:50:30 -0000

>>>>> On Thu, 9 Dec 2004 18:53:37 +0100, 
>>>>> "Konstantin KABASSANOV" <Konstantin.Kabassanov@lip6.fr> said:

>> Please provide more detailed network configuration.  Are you talking
>> about a router box forwarding packets onto gif and physical
>> interfaces?

> Well, this is a router box with 2 physical interfaces (say xl0 and rl0).
> Rl0 has a gif tunnel (gif0) over it. Xl0,rl0 and gif0 announce in their
> ifconfig an MTU of 1500, but 1300 bytes traffic generated from this box
> and sent through the gif0 interface is fragmented by the rl0 interface to
> 1280 bytes...
 
>   Please also specify the OS name (which I guess is
>> FreeBSD) and its version.

> FreeBSD 4.7 (yes it is a little bit old, but I think the problem still
> persist in more recent versions)... And that's why I'm asking if this
> behavior is normal or not...

This is not the intended behavior, and seems to be fixed at least on
FreeBSD 5.3.  I don't know whether the change is merged into 4.x.  At
least it's not the case with FreeBSD 4.10.

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