Is it a DSL modem?
If so, on the bottom of the modem should be a IP, is it 192.168.1.1?
if so, disconnect the router from the modem, log into your router (you should be able to use 192.168.1.1 now), change the LAN IP to 192.168.0.1, and save settings.
reconnect the router to the modem. reboot the modem and router. you should have a connection now.
I tried it but I still can't connect.