| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a network system and a communication method with which a P2P application can be executed by solving a NAT (address conversion table) problem even when a new port number is allocated onto a NAT apparatus. <P>SOLUTION: One communication apparatus transmits a pseudo packet including the address of other communication apparatus to a port information transmitting device through an address converting device before transmitting information to the other communication apparatus, the port information transmitting device transmits an answer to the received pseudo packet to the one communication apparatus, and the address converting device allocates new port information corresponding to the address of the one communication apparatus by the answer and transmits the address of the one communication apparatus and the allocated port information to the one communication apparatus. The one communication apparatus transmits the received address of the one communication apparatus and allocated port information to the other communication apparatus, and the other communication apparatus uses the received address of the one communication apparatus and allocated port information to transmit/receive information to/from the one communication apparatus. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
