I replaced my old Motorola cable modem last night with a new D-Link DCM-202 cable modem. It worked flawlessly when attached to a single computer, but will not work with my WRT54GS router. Details: 1. The WLAN, WAN, and Internet lights all light up green, but I cannot ping my modem. However, I can ping the router. 2. I have tried changing the router's IP to 192.168.2.1 in case the modem used the .1.1 IP range. 3. I have done all the resetting and unplugging you should always do first. 4. No cables are faulty. 5. Cloning the MAC address of a computer on the network hasn't worked. 6. I am using the WRT54GSv1.1 with the DD-WRT v23 SP1 Final firmware. 7. I have the same problem when using a WRT55AG router. Thanks for the help!