Patent ID: 7369563

Claim:
An Internet access gateway, comprising: a local network access point connected to a local network for accommodating any one of inputting and outputting of a packet to and from, respectively, a local network; an Internet access point connected to the Internet for accommodating any one of inputting and outputting the packet to and from, respectively, the Internet; a port translation table for accommodating storing nodes having identical Internet protocol address, public port numbers corresponding to each of the nodes, a local port number corresponding to each of the nodes, and a media access control address corresponding to each of the nodes; and an address translation processor for generating a public port number using a local port number and the media access control address included in an Internet protocol packet in a predetermined assigning manner when the Internet protocol packet is received at the local network, for storing said generated public number in the port translation table, for searching for a public port number corresponding to an Internet protocol packet with reference to the port translation table when the Internet protocol packet is received at the Internet, and for searching for a local port number corresponding to the public port number.