<div>Hey Michael,</div><div><br></div>I am probably not the best person to answer this but from my understanding, OLSRd uses MTU of the interface to decide packet size. The interface created by VPN tunnel should be setting proper MTU.<div>
<br></div><div>Could you post your OLSRd config file as well as the version of OLSRd you are using?<br clear="all"><div><br></div><div><br></div><div>Kind regards,</div>-- <br>Song Gao<br><div><a href="https://profiles.google.com/song.gao.beta/about" target="_blank">https://profiles.google.com/song.gao.beta/about</a></div>
<br>
<br><br><div class="gmail_quote">On Sat, Aug 11, 2012 at 3:49 PM, Michael Rack <span dir="ltr"><<a href="mailto:michael.rack@rsm-freilassing.de" target="_blank">michael.rack@rsm-freilassing.de</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi OLSR-Users!<br>
<br>
I have a VPN-Tunnel that runs over a PPPoE-Link, so i have only 1492 Bytes available. The VPN-Tunnel is established via UDP, so i have 8 Bytes (MAC), and 12 Bytes (UDP) overhead. So the remaining MTU is 1472 Bytes for the inner Layer-2.<br>
<br>
So there are 1452 Bytes left for OLSR.<br>
<br>
But OLSR currently send out packets with more then 1452 Bytes, so the VPN-Tunnel goes down and automatically get reestablished.<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Aug 11 21:18:50 vtund[6598]: Session neubichl-dsl-backup[79.192.<u></u>xxx.xxx:46105] opened<br>
Aug 11 21:18:50 vtund[6598]: UDP connection initialized<br>
Aug 11 21:19:29 vtund[6598]: Message too long (90)<br>
Aug 11 21:19:29 vtund[6598]: Session neubichl-dsl-backup closed<br>
</blockquote>
<br>
currently i drop packages over 1420 bytes that are passing the DSL-Interface:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
iptables -A OUTPUT -o tap107 -m length --length 1420: -j DROP<br>
</blockquote>
<br>
since that, the VPN-Tunnel is stable.<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
~ # ip route show table olsr-network | wc -l<br>
84<br>
</blockquote>
<br>
currently there are 84 routes spreaded over the whole network via OLSR. That can not result in a so high package size? How can i reduce the packet-size, or what have to be done, so olsr does not eat up more then 1400 Bytes?<br>
<br>
<br>
Liebe Grüße aus Freilassing,<br>
<br>
Michael Rack<br>
RSM Freilassing<span class="HOEnZb"><font color="#888888"><br>
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<br>
<br>
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</font></span></blockquote></div><br></div>