I currently have a wireless network set-up through Comcast. I have a Netgear modem/router from Comcast. I just purchased Time Capsule and I would prefer to use TC as my wireless network router instead of the Netgear modem/router. Do I need to have Comcast supply a new modem without the router or is there a way to connect TC and the Netgear modem without using the built-in router?