Hey, Tun(ADDR, MASK [, GATEWAY]) is now called KernelTap(ADDR/MASK [, GATEWAY]) Also: If you need to take an address/netmask pair, please use the cpIPPrefix type or the cp_ip_prefix() functions. That way people can say 10.0.0.0/8 as well as 10.0.0.0/255.0.0.0 -- much nicer! love, ed