From owner-freebsd-net@FreeBSD.ORG  Mon Oct 30 14:35:47 2006
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Date: Mon, 30 Oct 2006 14:33:16 +0000 (UTC)
From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net>
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To: Khetan Gajjar <khetan@os.org.za>
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Cc: "George V. Neville-Neil" <gnn@freebsd.org>, freebsd-net@freebsd.org
Subject: Re: Path MTU discovery broken in IPSec
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On Mon, 30 Oct 2006, Khetan Gajjar wrote:

> There are no firewall rules that are specific to the IPSec tunnels.

and no rules specific to ICMP?

> This, combined with the fact that small data transfer sessions
> across the IPSec tunnels work but small ones don't lead me to believe
> this could be a PMTU issue within the IPSec tunnel.

can you start trying with ping -s 1000 and going up to see when it
starts to fail? Try to find out exactly.

Also could you post the relevant netstat -rnW output?

-- 
Bjoern A. Zeeb				bzeeb at Zabbadoz dot NeT