My son and I are tring to connect his xbox to the internet and we are stumped. We are using a cable modem that is connected to our vonage box. The internet passes through the vonage box to a Mac Time capsule which loops through out and down to our basement where the Xbox console is located. I have a dumb hub in the basement connecting the Xbox as well as my Macbook pro which has no problem connecting to the internet with this wired connection. When I test the connection the Xbox says it can't obtain an IP address. I've power cycled the system with the same result. Any thoughts? Trouble shooting with Xbox is all PC base and we are all Mac here.