Linksys should burn their instructions and cd's....
Try this
1. connect the modem's ethernet port to the internet port of your WRT54G router
2. connect the pc to the regular port 1 2 3 or 4 on the back of your router
3. turn off the modem, hold the routers reset button for 30 seconds then release it
4. restart the computer
5. access the routers setup page by opening internet explorer, then type -
http://192.168.1.1
6. once youre prompted with a login, leave username blank password "admin"
7. go to MAC ADDRESS CLONE tab, enable this option, click CLONE YOUR PC'S MAC, then save settings
8. go back to setup tab, make sure internet connection type is set to - Automatic Configuration - DHCP
9. change the part where it says LAN IP address to 192.168.2.1
10.power off the router, then the computer for 1 minute
11. power on the modem first, then the router, lastly the computer (make sure you have the lights stable on the device before turning ON the next one...
12. try to get online after that