First, the working scenario. One OpenVPN client (2.1~rc11 under ubuntu 9.04) connects to a OpenvPN server (2.1~rc11 ubuntu 8.10) using a ethernet interface (eth0). Both use TUN device and UDP connection. But when I turn on the wireless interface (ifup wlan0) in the client ,the host can't communicate with the server anymore. I read a bit about the problem but didn't found a working solution. Maybe setting some iptable rules to mark the incoming datagrams to output them through the same interface. Any help would be appreciated.
Thanks in advance