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Date: Tue, 6 Oct 2009 11:49:08 +0200
From: Andrew Lunn <andrew@lunn.ch>
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Subject: Re: [B.A.T.M.A.N.] batman-adv and TCP problem
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To: The list for a Better Approach To Mobile Ad-hoc Networking <b.a.t.m.a.n@lists.open-mesh.net>

On Tue, Oct 06, 2009 at 11:26:01AM +0200, a wrote:
> It is correct. I'm using openwrt and, at the moment, without -M option.
> 1500byte packets work, with fragmentation.
> However, my TCP packets are small (about 60bytes). I have verified TCPDump
> file and packets arrive. It seems that the Linux IP stack does not forward
> them to the application.

Going back to your first email:

- B1 - bat0: 192.168.10.1/24 - default gateway: 192.168.10.2
- GW: bat0: 192.168.10.2/24,   eth1: 192.168.20.2/24
- EX: eth0: 192.168.20.3/24 - default gateway: 192.168.20.3

You default GW on EX does not make sense. You cannot use yourself as a
default gateway. It needs to be a remote device. In this case, EXs
default gateway should point to 192.168.20.2.

However, you say ping works, so that does not explain your problem.

Check your firewall rules. 

iptable -L

maybe one of the rules is causing the kernel to drop the packets.

      Andrew