Dear all,<br><br>I have solved my problem.<br><br>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).<br>
<br>This patch disable the tx checksum offload and everything now works fine for me!<br><br>--- soft-interface.c.old    2009-10-07 17:10:25.000000000 +0200<br>+++ soft-interface.c    2009-10-07 17:00:29.000000000 +0200<br>
@@ -114,7 +114,7 @@<br> #endif /* LINUX_VERSION_CODE &lt; KERNEL_VERSION(2, 6, 29) */<br>     dev-&gt;destructor = free_netdev;<br> <br>-    dev-&gt;features |= NETIF_F_NO_CSUM;<br>+    /* dev-&gt;features |= NETIF_F_NO_CSUM; */<br>
     dev-&gt;mtu = hardif_min_mtu();<br>     dev-&gt;hard_header_len = BAT_HEADER_LEN; /* reserve more space in the<br>skbuff for our header */<br><br><br>I’m not a kernel expert, and then let me know what do you think about this solution/workaround<br>
<br>andrea<br><br><br><div class="gmail_quote">On Tue, Oct 6, 2009 at 6:31 PM, a <span dir="ltr">&lt;<a href="mailto:a.mailevent@gmail.com">a.mailevent@gmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Dear all,<br><br>analyzing in deep the problem I have seen that the problem is the checksum: as you can see in my previous .cap file, the packets with data from 192.168.100.2 have a wrong checksum (and my nodes are not using the HW checksum offload function)<br>

Then, I’m starting to investigate how the checksum is calculated. If you have any suggestion or comment, you are welcome!<br><font color="#888888"><br>andrea</font><div><div></div><div class="h5"><br><br><br><br><br><div class="gmail_quote">
On Tue, Oct 6, 2009 at 3:14 PM, a <span dir="ltr">&lt;<a href="mailto:a.mailevent@gmail.com" target="_blank">a.mailevent@gmail.com</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Dear Marek,<br><br><div class="gmail_quote"><div>On Tue, Oct 6, 2009 at 2:55 PM, Marek Lindner <span dir="ltr">&lt;<a href="mailto:lindner_marek@yahoo.de" target="_blank">lindner_marek@yahoo.de</a>&gt;</span> wrote:<br>

<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br>
Hi,<br>
<div><br>
&gt; you can find as attachment the dump on eth2 of GW (tcpdump -ni eth2 -s 0 -w<br>
&gt; gw.cap);<br>
&gt; the output of batctl td -p 4 eth1 is:<br>
<br>
</div>I could not find anything revealing in the logs you provided. Could you please<br>
follow Sven&#39;s suggestion to log both ends as well ?<br>
<br></blockquote></div><div>I could log on every interface; I will do it and send .cap files.<br> <br></div><div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">



Just to not forget the obvious:<br>
* What batman-adv version are you running ?<br></blockquote></div><div>revision 1439<br> <br></div><div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">



* GW1 routes the packets - does this work via NAT or do you manually add<br></blockquote></div><div>GW1 routes packets, without NAT<br> </div><div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">



routing entries to both ends ?<br>
<div><br>
<br>
&gt; A question: am I the first one with this problem?<br>
<br>
</div>AFAIK batman-adv has no problem transporting TCP traffic (unless you found an<br>
undiscovered bug nobody has seen before). The most common source of trouble is<br>
the configuration of the setup, in particular MTU settings or routing issues<br>
(which is why most people simply bridge).<br></blockquote></div><div><br>I understand your point about batman-adv; also for me, among batman nodes everything works fine.<br>I will also test the system with bridge on GW<br>

<font color="#888888"><br>
<br>andrea<br></font></div><div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br>
Regards,<br>
<font color="#888888">Marek<br>
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