From owner-freebsd-net@FreeBSD.ORG  Tue Dec 27 19:31:59 2005
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Date: Tue, 27 Dec 2005 22:31:48 +0300
From: Gleb Smirnoff <glebius@FreeBSD.org>
To: Oleg Tarasov <subscriber@osk.com.ua>
Message-ID: <20051227193148.GP1496@cell.sick.ru>
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	Oleg Tarasov <subscriber@osk.com.ua>, freebsd-net@FreeBSD.org
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Cc: freebsd-net@FreeBSD.org
Subject: Re: Router on 6.0-stable fails to route tcp packets due to NAT??
	malfunction
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On Tue, Dec 27, 2005 at 05:55:19PM +0200, Oleg Tarasov wrote:
O> I have analysed the problem further and came to a conclusion that my
O> ISP's server is blocking ICMP type 3 packets what leads to the
O> malfunction.
O> 
O> I have the latest version of ported mpd (3.18_3) installed and tried
O> to insert
O>          set iface enable tcpmssfix
O> but no positive result, but I understand that this option should help
O> in this situation.

Unfortunately this options will not help in your situation. It affects
only the packets received on the mpd's interface, while you need
to alter outgoing packets.

I have fixed this in mpd CVS, but this isn't included in any release
yet. However, if you are experienced enough with CVS you can grab
and compile sources yourself.

O> Can you possibly tell me what am I doing wrong?
O> I'll say again that setting MTU on client machine to 1492 helps.
O> What can be the reason for tcpmssfix option not to be working? Maybe
O> there should be an additional kernel module loaded? I didnt find any
O> words mentioning usage of tcpmssfix in mpd's log file.

-- 
Totus tuus, Glebius.
GLEBIUS-RIPN GLEB-RIPE