Patent ID: 8717884

Claim:
An address-sharing system, comprising: an access router that connects to a global network allowing mutual access using only an Internet Protocol (IP) address and a network other than the global network, and performs packet transfer between the global network and the network other than the global network using an address and a port number; a port resource assigning device that manages the port number in a unit of the IP address and, when the packet transfer is performed between the global network and the network other than the global network, assigns the port number managed by the IP address preliminarily provided for the access router, wherein the access router performs the packet transfer using the IP address preliminarily provided for the access router and the port number assigned by the port resource assigning device; and a connection device that connects the global network and the network other than the global network, wherein the access router performs the packet transfer via the connection device, and wherein the connection device, when a communication session for the packet transfer is started, requests the port resource assigning device to assign the port number, and sets, for the connection device, a packet transfer path having the port number assigned to the access router by the port resource assigning device.