From owner-freebsd-stable@FreeBSD.ORG  Thu Aug 12 10:43:39 2004
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Date: Thu, 12 Aug 2004 11:38:58 +0200
From: Ronald van der Pol <Ronald.vanderPol@rvdp.org>
To: Mark Andrews <Mark_Andrews@isc.org>
Message-ID: <20040812093857.GA12644@rvdp.org>
References: <200408120202.i7C22HTT000463@drugs.dv.isc.org>
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cc: stable@freebsd.org
Subject: Re: 4.10 STABLE: IPv6 PMTU Discovery broken
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On Thu, Aug 12, 2004 at 12:02:17 +1000, Mark Andrews wrote:

> 	The box does not appear to be generating a ICMP6 too big error
> 	message which I would expect to see once the 1428 octet TCP
> 	segments start arriving.

You could also check the output of:
netstat -s -p icmp6

There have been some changes in the IPv6 area that might be relevant.
You could check the dates of these changes (icmp6.c, raw_ip6.c):
http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netinet6/

	rvdp