You can find helpful directions on configuring your home gateway device (such as an Apple Airport Extreme) on MyDeviceInfo (»
mydeviceinfo.comcast.net). It is significant and notable that, up to now, IP addressing (with IPv4) has been shared. That means a typical Internet user has used Network Address Translation (NAT) to share a single IP address across multiple devices in the home. That all changes with IPv6 - which means the need for NAT and shared addressing goes away. We hope this change will unleash new innovation in home networking and other in-home Internet services.