Patent ID: 7684397
Filing Date: 2010-03-23
Classification: H04L

Abstract:
1. A network using a network address translation (NAT) technique, comprising: a Simple Traversal of UDP over NAT (STUN) server for transmitting to a private network terminal a public Internet Protocol (IP) address and first port information of a router requested by the private network terminal for setting up a session with an external network terminal; wherein the private network terminal transmits a session setup request message, including the public IP address and the first port information of the router for setting up the session with the external network terminal, using its private IP address and a second port, wherein the session setup request message comprises a payload field including the public IP address and the first port information of the router, and a source address field including the private IP address and the second port information of the private network terminal, and wherein the router extracts the first port information of the router from the payload field of the session setup request message, and the private IP address and the second port information of the private network terminal from the source address field, and stores the first port information of the router and the private IP address and the second port information of the private network terminal in a NAT table, and forwards a packet received through the first port to the private network terminal through the private IP address and the second port using the stored information.