[Olsr-users] Too big packets | > 1420 Bytes!

[Song Gao]

Hey Michael,

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.

Could you post your OLSRd config file as well as the version of OLSRd you
are using?


Kind regards,
-- 
Song Gao
https://profiles.google.com/song.gao.beta/about



On Sat, Aug 11, 2012 at 3:49 PM, Michael Rack <
(spam-protected)> wrote:

> Hi OLSR-Users!
>
> 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.
>
> So there are 1452 Bytes left for OLSR.
>
> But OLSR currently send out packets with more then 1452 Bytes, so the
> VPN-Tunnel goes down and automatically get reestablished.
>
>  Aug 11 21:18:50 vtund[6598]: Session neubichl-dsl-backup[79.192.**xxx.xxx:46105]
>> opened
>> Aug 11 21:18:50 vtund[6598]: UDP connection initialized
>> Aug 11 21:19:29 vtund[6598]: Message too long (90)
>> Aug 11 21:19:29 vtund[6598]: Session neubichl-dsl-backup closed
>>
>
> currently i drop packages over 1420 bytes that are passing the
> DSL-Interface:
>
>> iptables -A OUTPUT -o tap107 -m length --length 1420: -j DROP
>>
>
> since that, the VPN-Tunnel is stable.
>
>  ~ # ip route show table olsr-network | wc -l
>> 84
>>
>
> 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?
>
>
> Liebe Grüße aus Freilassing,
>
> Michael Rack
> RSM Freilassing
> --
> RSM Freilassing                 Tel.: +49 8654 607110
> Nocksteinstr. 13                Fax.: +49 8654 670438
> D-83395 Freilassing            www.rsm-freilassing.de
>
>
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