I have Linksys BEFW11S4. It will not obtain an IP address from Adelphia. I can take this router to a friends house and works fine. I can connect my computer straight to cable modem and it works fine. I can connect computer to router and access router's built in setup pages. I have reset router, upgraded firmware and tried every possible combination of restarting network devices. I have even tried cloning the MAC address from my network card then restarting and still not luck. I even tried new CAT 5 cables. Still will not work. But it works at friends house Is there something else I am not aware of I can try?