So I've created A01interfaces.rul containing EXTERNAL="eth0" INTERNAL="eth1 tun0" as well as A01precompute.rul containing IPOFIF_eth0=172.16.0.2 NMOFIF_eth0=255.255.255.0 IPOFIF_eth1=192.168.122.1 NMOFIF_eth1=255.255.255.0 IPOFIF_tun0=10.8.0.6 NMOFIF_tun0=255.255.255.0 but to no avail :-( Martin