installed package is 2.3.12, 2.3.13 is available, you're right with the update. But it's not an openvpn issue I think. The command
openvpn --mktun --dev tap1 mode tap seems to be the last working command in the installscript, because the tap divece was created.
The installscript didn't work correctly. I had to manually get tap1 up (
ifconfig tap1 up) and join it to the existing bridge br0 (
brctl addif br0 tap1). This is the bridge created for nsdc-container. OpenVPN works fine now. But it's maybe VM related.
AFAIK you can build bridges with virtual diveces also, but for a vpn tunnel you need a nic connected to the internet on which you can bridge the virtual tap device. I choose bridged mode, because I get an privat IP in the network and so the machine is fully equivalent to any machine in the network. It's like I were at work. (and it's easier to set up )