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From: Marek Lindner <lindner_marek@yahoo.de>
Date: Thu, 8 Oct 2009 09:33:37 +0800
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Subject: Re: [B.A.T.M.A.N.] batman-adv and TCP problem - SOLVED
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Hi,

> I have solved my problem.
> 
> It is related to the TCP checksum offload function: I am using as embedded
> platform PCEngines Alix 3d2, that do not support this function (and also
> qemu virtual machines do not support it).
> 
> This patch disable the tx checksum offload and everything now works fine
>  for me!

nice finding !
I looked through kernel source a bit and it seems we can live without that flag 
(the tun driver also does not set it). I would commit your patch to the 
repository unless there are objections ?

Regards,
Marek