I'm having a bizarre problem with our internet connection in our temporary house. We have been given a cable modem with (i believe comcast) internet connectivity.
If i plug my macbook pro directly into the modem, it offers up an IP address with DHCP and everything works fine. However when I connect my wireless router (linksys wireless n), it is never able to receive an IP address from the modem. I thought this was strange, so I ordered a new router from our housing people. They gave us a netgear router, and the same result occurred - no internet.
Finally, I plugged our other laptop (Windows vista) directly into the modem, and still no internet. Any thoughts on what is going on here? Why is my macbook pro the only device out of 4 that is able to get an IP address from the modem?