From owner-freebsd-net@FreeBSD.ORG  Sun Oct  1 03:34:06 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 06BB216A412
	for <freebsd-net@freebsd.org>; Sun,  1 Oct 2006 03:34:06 +0000 (UTC)
	(envelope-from motoyuki@mk.bsdclub.org)
Received: from mail.mk.bsdclub.org (l209160.ppp.asahi-net.or.jp
	[218.219.209.160])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 7242D43D49
	for <freebsd-net@freebsd.org>; Sun,  1 Oct 2006 03:34:04 +0000 (GMT)
	(envelope-from motoyuki@mk.bsdclub.org)
Received: from mserver.mk.bsdclub.org (nobody@localhost.mk.bsdclub.org
	[127.0.0.1])
	by mail.mk.bsdclub.org (8.13.7+3.5Wbeta/8.13.7) with ESMTP/inet id
	k913XoCt087276; Sun, 1 Oct 2006 12:33:50 +0900 (JST)
	(envelope-from motoyuki@mserver.mk.bsdclub.org)
Message-Id: <200610010333.k913XoCt087276@mail.mk.bsdclub.org>
To: Stefan `Sec` Zehl <sec@42.org>
From: Motoyuki Konno <motoyuki@bsdclub.org>
References: <20061001004527.GA8387@ice.42.org>
User-Agent: EMH/1.10.0 SEMI/1.14.6 (Maruoka) FLIM/1.14.8 (=?ISO-8859-4?Q?S?=
	=?ISO-8859-4?Q?hij=F2?=) APEL/10.6 Emacs/21.3 (i386--freebsd) MULE/5.0
	(SAKAKI)
MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka")
Content-Type: text/plain; charset=US-ASCII
Date: Sun, 01 Oct 2006 12:33:50 +0900
Sender: motoyuki@mk.bsdclub.org
Cc: freebsd-net@freebsd.org
Subject: Re: ipv6 and magically vanishing routes via gif0
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: Sun, 01 Oct 2006 03:34:06 -0000

Hi,

I had the same problem on my FreeBSD 6-STABLE box.
Fix was already committed to -current (src/sys/netinet6/nd6.c
rev 1.69), but not yet to 6-STABLE.

Try src/sys/netinet6/nd6.c rev 1.48.2.13 (older version)
instead of 1.48.2.14.

--
motoyuki

Stefan `Sec` Zehl <sec@42.org> wrote:
> Hi,
> 
> I just upgraded from FreeBSD-5 to -6, and now my default route via gif0
> vanishes after 7 seconds.
> 
> | ice:~#ifconfig gif0
> | gif0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1280
> |         tunnel inet 194.77.85.2 --> 193.149.44.208
> |         inet6 fe80::20e:a6ff:fe04:ea37%gif0 prefixlen 64 scopeid 0x14
> |         inet6 2001:608:9::1 prefixlen 128
> | 
> | ice:~#route add -inet6 default -interface gif0
> | add net default: gateway gif0
[snip]
> In fact, any route '-interface gif0' will vanish 7 seconds after the
> first packet via that link.
> 
> After some wild guesses, I found out, that ndp seems to be the culprit
> here. -- If I disable ndp on gif0 with 
> 
> | ice:~#ndp -i gif0 -- -nud
> | linkmtu=0, maxmtu=1280, curhlim=64, basereachable=30s0ms, reachable=18s, re
trans=1s0ms
> | Flags: accept_rtadv
> 
> Then the routing table stays as it should.
> 
> The question is, am I missing something here? Can anybody reproduce that
> problem?
> 
> It seems wrong that the kernel would delete static routes without even a
> single log message.  Furthermore I find it kind of strange that there is
> neighbour discovery happening at all on an tunnel interface.