COMMUNICATION METHOD OF TERMINALS BASED ON THE REUSE OF NETWORK ADDRESS TRANSLATION PORT MAP

摘要

PURPOSE: A method of communication between terminals based on the reuse of NAT port mapping is provided to stably maintain the connection of a host terminal by reducing the load of a sharer router. CONSTITUTION: A host terminal communicates with an external terminal or a server in a normal way (S150). The host terminal stores a communication port of the host terminal used in communication when the communication between terminals is interrupted (S160). The host terminal generates a test packet by using an internal IP and the stored communication port and transmits the test packet when the reconnection is requested (S170-S190). The host terminal performs communication by using the internal IP or the communication port when a response message with regard to the transmitted test packet is received (S200). [Reference numerals] (AA) No; (BB) Yes; (S110) Request communication; (S120) Allocate a port number; (S130) Generate a port mapping entry; (S140) Punch a hole; (S150) Communicate; (S160) Interrupt the communication; (S170) Request reconnection; (S180) Generate a test packet; (S190) Transmit the test packet; (S200) Receive a response packet?