Patent ID: 7899055

Claim:
A method for route optimization with a dual mobile IPv4 node in an IPv6-only network, the method comprising: receiving a visited IPv6 address from a first router when the dual mobile node is connected to the IPv6-only network; updating a home agent with the visited IPv6 address; deregistering a binding update with a correspondent node via the home agent; updating the correspondent node with the visited IPv6 address; checking a reachability of packets directly to the correspondent node using an IPv6 address of the correspondent node; starting sending data packets, from the mobile node to the correspondent node, tunneled in a first IPv6 packet once the reachability is verified; and sending tunneled data packets from the correspondent node directly to the visited IPv6 address of the mobile node, wherein the deregistering of the binding update with the correspondent node via the home agent comprises deregistering a previous binding update of the mobile node with the correspondent node by sending, to the correspondent node via the home agent, a binding update packet encapsulated in a second IPv6 packet.