Patent ID: 8422458

Claim:
A Fast Mobile Internet Protocol version 6 (FMIPv6) address system which performs a handoff resulting in seamless Transmission Control Protocol (TCP) packet transmissions, the FMIPv6 system comprising: a new access router; a previous access router which uses existing information on the new access router to configure in advance a new care-of address (NCoA) used for the new access router; a mobile node which moves to the new access router from the previous access router; and a correspondent node communicating with the mobile node; wherein the previous access router notifies the mobile node of the NCoA to enable the mobile node to perform a binding update when linked to a new network, and sets up a bi-directional tunnel with the new access router and tunnels packets received from the corresponding node to the new access router in order to prevent loss of packets sent from the correspondent node before the binding update is completed for the NCoA, and wherein the previous access router comprises a TCP acknowledgement (ACK) generation module which generates a TCP ACK of the received packets and sends the generated TCP ACK to the correspondent node when the received packets are tunneled to the new access router through the set bidirectional tunnel.