Hi What type of internet connection does the modem use, PPPoE or PPPoA? I don't know this ZyXEL modem, but I have the WRT-54G with a PPPoA modem router that uses half-bridging. ADSL PPPoA DHCP to pick up ISP IP address -> half bridging enabled, NAT/ Firewall disabled -> WRT54G running hyperwrt set up with DHCP, gets passed ISP IP from modem (this is the half bridging) and runs firewalling and NAT from wrt54g. The wrt54g then issues local IP address, 192.1.0.x range to clients behind it. cheers Rich