[B.A.T.M.A.N.] MTU/connection problem

[Clemens John <clemens-john@gmx.de>]

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Hi,

I have a problem to connect to the Internet. We are using Batman advanced 
0.2.1 and IPv4 here in oldenburg. Our setup looks like this:

Laptop-[wifi]->Fonera-[wifi]->Dir300-->OpenVPN-->
virtual OpenWrt machine-->internet.

The default route of the laptop goes to the virtual OpenWrt machine wich 
provides an Internet connection.

I can acces google (wget google.de) but not heise.de or golem.de. I´m not 
verry familar with network configurations but I heared that this might be an 
mtu problem.

All devices in the network (tap0, ath0, ath1, wifi0) have an mtu of 1524 except 
bat0 and br-mesh which have an mtu of 1500.

Our routers are configured to bridge connections from non batman devices (like 
the laptop) to bat0. This is done in the device "br-mesh".

Everythink works fine, except I can´t connect to internet websites that are not 
google.de.

When I decrease the mtu of the wireless device of the laptop to 1476 
everything works fine.
But I have to do this by hand and on a client this is bad.

Does anybody know what I´m doing wrong?

Greetings
Clemens

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