Question : Can't connect to internet through Linksys router and Comcast modem

I recently signed up for Comcast cable internet and digital phone service and the installer came out and hooked up a modem that runs both the internet and phone services.  I plugged my computer directly into the modem and was able to access the internet.  I then switched my computer to plug into my Linksys WRT54GL (running stock firmware) and plugged the Linksys into the Comcast modem.  

At first the modem wouldn't get a WAN IP from the modem, but then I cloned my PC's MAC to the Linksys and was able to get a WAN IP.  Did an ipconfig /release and /renew on the PC to make sure everything was current, but I'm not able to access the internet or ping google.com from the PC.

I can ping google.com through the Linksys's web-based config page, but I can't from my PC.  What would cause this?  Here is my ipconfig info:

Linksys IP:  192.168.1.1

PC IP:  192.168.1.100
Gateway:  192.168.1.1
DHCP server:  192.168.1.1
DNS servers:  68.87.76.**2, 68.87.76.**4

Answer : Can't connect to internet through Linksys router and Comcast modem

Are you manually inputting the DNS entries on your PC?
If so, allow it to pick them up via DHCP.
Typically your DNS is the same IP as the Router in your type of setup.  
I'm trying to eliminate variables.
MDP