Patent ID: 7373429
Filing Date: 2008-05-13
Classification: H04L

Abstract:
1. An integrated IP network, wherein: said integrated IP network includes a plurality of IP networks and a plurality of network node devices, said network node devices including address management tables comprising a plurality of records, a first network node device being connected to a first IP network via a first internal line and being connected to a second IP network via a second internal line, and a second network node device being connected to said first IP network via a third internal line and being connected to said second IP network via a fourth internal line, first and second records being set at an address management table in said first network node device, the first record comprising a network identifier that designates the first IP network and the second record comprising a network identifier that designates the second IP network a first terminal being connected to said first network node device by a first network node terminal via a first communication line, and a second terminal being connected to said second network node device by a second network node terminal via a second communication line; wherein: when an external IP packet sent from said first terminal is input to said first network node device from said first network node terminal, said first network node device compares an IP address and a port number included in said external IP packet with an IP address and a port number included in said first record, and: if the IP address and port number included in said external IP packet and the IP address and port number included in said first record coincide respectively, said first network node device IP-capsulates said external IP packet and then forms an internal IP packet, said first network node device sending said internal IP packet to said first internal line, and said internal IP packet being transferred in said first IP network and said third internal line and then reaching said second network node device, in compliance with the network identifier in said first record, if said IP addresses and said port numbers do not coincide, said first network node device compares the IP address and the port number included in said external IP packet with an IP address and a port number included in said second record, and if the IP address and port number included in said external IP packet and the IP address and port number included in said second record coincide respectively, said first network node device IP-capsulates said external IP packet and then forms an internal IP packet, said first network node device sending said internal IP packet to said second internal line, and said internal IP packet being transferred in said second IP network and said fourth internal line and then reaching said second network node device, in compliance with the network identifier in said second record, or if said IP addresses and said port numbers do not coincide, said external IP packet is discarded; said external IP packet being restored from said internal IP packet at said second network node device, and said external IP packet being sent to said second terminal via said second communication line.