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PEER-TO-PEER COMMUNICATION METHOD BETWEEN PRIVATE IP NETWORKS CONNECTED TO A PUBLIC NETWORK THROUGH PORT NUMBER CONTROL, PARTICULARLY FOR ENABLING COMMUNICATION BETWEEN DIFFERENT PRIVATE IP NETWORKS BY ADOPTING A NETWORK CONFIGURATION AND NETWORK CONFIGURATION EQUIPMENT AT LOW COST
PEER-TO-PEER COMMUNICATION METHOD BETWEEN PRIVATE IP NETWORKS CONNECTED TO A PUBLIC NETWORK THROUGH PORT NUMBER CONTROL, PARTICULARLY FOR ENABLING COMMUNICATION BETWEEN DIFFERENT PRIVATE IP NETWORKS BY ADOPTING A NETWORK CONFIGURATION AND NETWORK CONFIGURATION EQUIPMENT AT LOW COST
PURPOSE: A peer-to-peer communication method between private IP networks connected to a public network through port number control is provided to supply routing information on a receiving terminal to a connection-attempting originating terminal, and to convert a destination address of a data packet into a private IP address according to an L4 port number by the first device, so that the data packet of the originating terminal can arrive at the receiving terminal. CONSTITUTION: The first terminal(AA) transmits a created address inquiry packet to an address management server(200)(S201). A private IP address is converted into a public IP address by the first NAPT(Network Address Port Translation) server(110)(S202), and the packet arrives at the server(200)(S203). The server(200) retrieves an IP address of the NAPT server(110) and an L4 port number(S204), and transmits a created response packet to the first terminal(AA)(S205). A destination address is converted into a private IP address by the server(110)(S206), and the response packet is transmitted to the first terminal(AA)(S207). The first terminal(AA) creates a VoIP packet(S208), and transmits the packet to the server(110)(S209). The server(110) transmits the VoIP packet to the second NAPT server(120)(S210). The second server(120) converts a destination address of the VoIP packet into a private IP address(S211), and transmits the converted packet(S212). The server(120) transmits the converted VoIP packet to the server(110)(S214). The server(110) converts a destination address of the converted packet into a private IP address(S215), and transmits the converted packet to the first terminal(AA)(S216).
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