From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marek Lindner <lindner_marek@yahoo.de>
Subject: Re: [B.A.T.M.A.N.] two-way-tunnel quirks
Date: Thu, 6 Dec 2007 04:18:37 +0100
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To: The list for a Better Approach To Mobile Ad-hoc Networking <b.a.t.m.a.n@open-mesh.net>


Hi,

> ok, set mtu on upstream gw to 1400, and everything remains as before :-(
> (didn't check at the upstream gw yet, but from inside the mesh i can
> also access hotmail when 1-way-tunnel, and not access hotmail when
> 2-way-tunnel)
> and tried another one with mtu 1200... still the same, seems not
> related.

one more idea: Do you clamp the MSS on the batman gateway client ?
It is somehow related to the MTU problem.
You can try this iptables command:
iptables -I FORWARD -p tcp --tcp-flags SYN,RST SYN -j 
TCPMSS --clamp-mss-to-pmtu

Regards,
Marek