From mboxrd@z Thu Jan  1 00:00:00 1970
From: Simion Onea <simionea@gmail.com>
Subject: Re: Forwarding packets over the same LAN
Date: Tue, 14 Jul 2009 16:06:08 +0300
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To: Thomas Jacob <jacob@internet24.de>
Cc: netfilter@vger.kernel.org

On Tue, 2009-07-14 at 14:27 +0200, Thomas Jacob wrote:
> Is eth0 your actual interface then? This was just an example to give you
> the general idea, of course you need to adjust that to your case.

Yes, certainly. The interface is eth0.

> Maybe you could post the LOG output from the rules below here, so we can
> see what's wrong

I tried to connect from a host with the address 172.20.2.40. 
Here are the log lines of 172.20.1.245:

Jul 14 10:48:46 pro kernel: PREROUTING_before:IN=eth0 OUT=
MAC=00:13:72:fc:1d:e5:00:13:21:e7:e8:00:08:00 SRC=172.20.2.40
DST=172.20.1.245 LEN=48 TOS=0x00 PREC=0x00 TTL=127 ID=4621 DF PROTO=TCP
SPT=1749 DPT=10025 WINDOW=65535 RES=0x00 SYN URGP=0 OPT
(020405B401010402)
Jul 14 10:48:49 pro kernel: PREROUTING_before:IN=eth0 OUT=
MAC=00:13:72:fc:1d:e5:00:13:21:e7:e8:00:08:00 SRC=172.20.2.40
DST=172.20.1.245 LEN=48 TOS=0x00 PREC=0x00 TTL=127 ID=4624 DF PROTO=TCP
SPT=1749 DPT=10025 WINDOW=65535 RES=0x00 SYN URGP=0 OPT
(020405B401010402)
Jul 14 10:48:55 pro kernel: PREROUTING_before:IN=eth0 OUT=
MAC=00:13:72:fc:1d:e5:00:13:21:e7:e8:00:08:00 SRC=172.20.2.40
DST=172.20.1.245 LEN=48 TOS=0x00 PREC=0x00 TTL=127 ID=4691 DF PROTO=TCP
SPT=1749 DPT=10025 WINDOW=65535 RES=0x00 SYN URGP=0 OPT
(020405B401010402)

Regards,
Simion.