Ok, I tried putting Address=172.20.0.6 (my openvpn address), but all connections still seem to be made locally, none via the vpn.
What could I be doing wrong?
EDIT: Ok, I'm postponing this question. Obviously just listening on the openvpn address doesn't route created connections through it. Hope I can figure out how to narrow an iptables rule down to all packages from amule. Any ideas?