Patent ID: 7680111
Filing Date: 2010-03-16
Classification: H04L,H04W

Abstract:
1. A method of an NAT-PT (Network Address Translation-Protocol Translation) box for an TPv6 node in an IPv6 network to communicate with a foreign IPv4 node in an IPv4 network, the method comprising: (a) allowing the NAT-PT box to receive an RR (Return Routability) request transmitted to the IPv4 node from the IPv6 node when the IPv6 node moves from a home network in the IPv6 network to another network in the IPv6, and perform an RR process which includes responding to the RR request to determine whether a changed address of the IPv6 node is a reachable address while communicating with the IPv4 node, as a substitute for the IPv4 node without allowing the IPv4 node to respond to the RR, wherein the NAT-PT box stores key conversion notice data related to the IPv4 node and generates at least one parameter and a Care-of keygen token for the RR process in response to the RR request and includes the at least one parameter and the Care-of keygen token in an outgoing message to the IPv6 node; (b) allowing the NAT-PT box to receive a BU (Binding Update) message transmitted to the IPv4 node from the IPv6 node, and perform a BU process as a substitute for the IPv4 node; and (c) allowing the NAT-PT box to use BU information generated when performing the BU process, and perform data communication between the IPv6 node and the IPv4 node.