Patent ID: 6101552
Filing Date: 2000-08-08
Classification: H04L

Abstract:
A virtual internet protocol (IP) gate, between a legitimate internet and a virtual internet, said virtual internet addresses are selected from a specific range of said legitimate internet addresses, and said virtual IP gate comprising at least:a connection module for establishing a connection with said virtual internet through at least a virtual internet address in the aforementioned specific range and a connection with said legitimate internet through at least an internet address not in the aforementioned specific range;an address conversion module, corresponding to an address conversion port number, for receiving a transmission packet transmitted from a first processing module of said virtual internet to a second processing module of said legitimate internet, wherein the <source address: source port number> and <destination address: destination port number> of the transmission packet are the <first processing virtual internet address: first processing port number> corresponding to said first processing module and the <second processing internet address: second processing port number> corresponding to said second processing module; andsaid address conversion module is for recording the <first processing virtual internet address: first processing port number> of said first processing module and takes the <internet address of virtual IP gate: address conversion port number> corresponding to said address conversion module and the <second processing internet address: second processing port number> corresponding to said second processing module as the <source address: source port number> and <destination address: destination port number> of said transmission packet for forwarding said transmission packet to said second processing module, andsaid address conversion module is for receiving the response packet transmitted by said second processing module back to said first processing module, the <source address: source port number> and <destination address: destination port number> of the response packet are the <second processing internet address: second processing port number> corresponding to said second processing module and the <internet address of virtual IP gate: address conversion port number> corresponding to said address conversion module, and said address conversion module replaces the <destination address: destination port number> of said response packet with the <first processing virtual internet address: first processing port number> of said first processing module as recorded by said address conversion module, whereas the <source address: source port number> of said response packet remains unchanged, for transmitting said response packet back to the first processing module.