Problem Connecting Linksys WRT54G to Arris TM402P/100 Cable Modem

The Problem
Cannot get an internet connection attempting to install a Linksys WRT54G router between an Arris TM402P/100 cable modem and the local network.
Prior Configuration
Previously had DSL, with the Linksys WRT54G wireless router between the DSL modem and the local network, which worked perfectly.
New Configuration
This friend recently changed his broadband from DSL to Comcast cable, and he also has phone and television service over the same connection. The installation tech connected the cable modem directly to a desktop computer and left the Linksys router out.
The direct connection between the cable modem and the computer works fine, but he and his wife each have laptops and would like to us the Linksys router to connect wirelessly.
This is the TCP/IP configuration of the FAMILY workstation connected to Comcast
directly through Arris TM402P/110 cable modem:
Windows IP Configuration
       Host Name . . . . . . . . . . . . : family
       Primary Dns Suffix . . . . . :
       Node Type . . . . . . . . . . . . : Hybrid
       IP Routing Enabled. . . . . . : No
       WINS Proxy Enabled. . . .. : No
       DNS Suffix Search List. . .. : hsd1.wa.comcast.net.
Ethernet adapter Local Area Connection:
       Connection-specific DNS Suffix . : hsd1.wa.comcast.net.
       Description . . . . . . . ...... . . . : Intel(R) PRO/100 VE Network Connection
       Physical Address. . . . . . . . . : 00-11-11-6F-FB-69
       Dhcp Enabled. . . . . . . . . . . : Yes
       Autoconfiguration Enabled . . . . : Yes
       IP Address. . . . . . . . . . . . : 67.185.155.0
       Subnet Mask . . . . . . . . . . . : 255.255.254.0
       Default Gateway . . . . . . . . . : 67.185.154.1
       DHCP Server . . . . . . . . . . . : 68.87.69.10
       DNS Servers . . . . . . . . . . . : 68.87.69.146
                                                    68.87.85.98
       Lease Obtained. . . . . . . . . : Tuesday, January 09, 2007 5:39:26 PM       Lease Expires . . . . . . . . . . : Friday, January 12, 2007 9:58:23 AM
I cannot find a configuration on the Linksys WRT54G that will allow me to connect to the internet through the Arris TM402P/110 modem. Have tried (1) setting the Linksys to use a dynamic WAN address, (2) setting the Linksys to static IP 67.185.155.0 with TCP/IP settings taken from the above configuration, (3) cloning the MAC address of the desktop computer's NIC and trying both (1) and (2) again.
The error message says that the network cable is not connected. Is it possible that the connection between the router and cable modem requires a cross-over cable?
Any suggestions?

on the router's ui... keep the internet type to dhcp....clone the mac address and then do a power cycle...ensure that the modem is completely powered off during the power cycle...if you have a battery back - up , remove the battery...after a minute , put back the battery and then plug in the power cable in the modem...
let me know if this helps you....

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Message Edited by Skippy423 on 09-02-2007 11:10 PM

hi...you should try putting a hub in between the modem and the router .. it helps sometimes....

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