Our home is becoming more and more intelligentized. In the home network, the residential gateway plays a key role in the data interchange between external networks and home network, this paper proposes an idea that the home network should guarantee a unique visiting interface. Furthermore, this paper designs and implements the central forwarding mechanism of the residential gateway, and exchanges between outer networks and home network must be through the residential gateway. This paper is of valuable reference for network researchers and engineers to be engaged in the further study on the home network.

IPv4 and IPv6 will coexist for a long time, due to ISPes’ inertia in the transition from IPv4 to IPv6. Domain Name System (DNS) is a very important functional unit in the Internet. This paper describres the hierarchy and operating process of IPv6 DNS, IPv6 DNS resolver, and presents the DNS transition from IPv4 to IPv6 in particular. We suggest two methods to implement DNS service during the transition period: DNS-Application Level Gateway (DNS-ALG) with Network Address Translation-Protocol Translation (NAT-PT), and dual stacks. And we also propose their respective operational principles. This paper is of valuable reference for network engineers to construct DNS in the transition phase.