NETWORK COMMUNICATION METHOD AND ITS SYSTEM

摘要

PROBLEM TO BE SOLVED: To achieve tunneling communication between terminal apparatuses in different network system, which are connected via an NAT-GW device. SOLUTION: The NAT-GW device interposed between an external segment and an internal segment includes: a tunneling communication control part for controlling the destination of a tunneling packet; and a tunneling packet relay part for relaying the tunneling packet between an external terminal apparatus and a tunneling communication terminating apparatus. Connection is waited by one TVP port and the TCP connection is established between the external terminal apparatus and the NAT-GW device. Another TCP connection is established between the NAT-GW device and the tunneling communication terminating apparatus. The respective TCP connections are associated with the IP addresses and port numbers of the respective terminals of the external terminal apparatus and an internal terminal apparatus. The packet communication is performed between the external segment and the internal segment by using the TCP connection corresponding to destination information included in the tunneling packet. COPYRIGHT: (C)2008,JPO&INPIT