
to CF
Your problem is that your router is for ADSL not Cable Broadband
http://www.netgear.com/products/details/DG834G.php
A cable router has the hardware that allows it to get an IP address from the CM on it's 'WAN' port. Your router is designed to plug into the ADSL splitter and be useds as an ADSL modem.
Sorry, but I hope you can take it back and get a Cable Broadband router, eg
http://www.netgear.com/products/details/WGT624.php