Integrated IP network
First Claim
1. An integrated IP network including:
- a plurality of IP networks; and
a plurality of network node devices;
wherein the network node devices are each connected to one or more of the IP networks via communication circuits and have their network node-points connected to external terminals via communication circuits;
wherein, when the network node device receives an IP packet from the external terminal, the following sequence of operations is performed;
in a first case where a network node-point address of the network node-point through which the received IP packet has passed is registered in an address management table as not specifying a virtual dedicated line connection, a source terminal address, a destination terminal address and a port number registered in the address management table are compared with a source terminal address, a destination terminal address, a source port number and a destination port number contained in the IP packet to find a record containing a network identifier indicating a destination IP network to which the IP packet is to be sent;
in a second case where a network node-point address of the network node-point through which the received IP packet has passed is registered in the address management table as specifying a virtual dedicated line connection, a record containing a network identifier indicating a destination IP network to which the IP packet is to be sent is detected;
after the procedure of the first case or the second case is completed, the source network node-point address and the destination network node-point address contained in the detected record are used to generate an integrated IP network packet which is then sent to the destination IP network;
the integrated IP network packet passes through an IP packet exchange point and the destination IP network and reaches another network node device where an integrated IP network header is removed from the integrated IP network packet to restore the sending IP packet which is then sent to a destination IP terminal;
wherein the address management table is referenced to select a destination IP network to which the IP packet is to be transferred and the IP packet is sent to the destination IP network, and the integrated IP network packet is passed through two or more IP networks of different communication companies within the destination IP network and through IP packet exchange points.
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0 Petitions
Accused Products
Abstract
To provide an integrated IP network containing therein a plurality of separated IP networks with a variety of characteristics, such as IP telephone network, IP video network, IP electronic text network, best effort network, IP data multicast network and IP-based TV broadcast network. In the integrated IP network there are virtually installed a plurality of IP networks with various features, such as IP telephone network, IP video network, IP electronic text network, best effort network, IP data multicast network and IP-based TV broadcast network. An address management table is set in each of the network node devices installed at input points through which the integrated IP network is accessed from outside. The address management table is registered beforehand with terminal addresses and port numbers identifying the application programs (AP) in the terminal. The address and port number written in the IP packet entered into the integrated IP network are compared with those registered in the address management table to route, inside the integrated IP network, the IP packet to an appropriate IP network. The port number may not be used and only the addresses may be compared.
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Citations
15 Claims
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1. An integrated IP network including:
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a plurality of IP networks; and
a plurality of network node devices;
wherein the network node devices are each connected to one or more of the IP networks via communication circuits and have their network node-points connected to external terminals via communication circuits;
wherein, when the network node device receives an IP packet from the external terminal, the following sequence of operations is performed;
in a first case where a network node-point address of the network node-point through which the received IP packet has passed is registered in an address management table as not specifying a virtual dedicated line connection, a source terminal address, a destination terminal address and a port number registered in the address management table are compared with a source terminal address, a destination terminal address, a source port number and a destination port number contained in the IP packet to find a record containing a network identifier indicating a destination IP network to which the IP packet is to be sent;
in a second case where a network node-point address of the network node-point through which the received IP packet has passed is registered in the address management table as specifying a virtual dedicated line connection, a record containing a network identifier indicating a destination IP network to which the IP packet is to be sent is detected;
after the procedure of the first case or the second case is completed, the source network node-point address and the destination network node-point address contained in the detected record are used to generate an integrated IP network packet which is then sent to the destination IP network;
the integrated IP network packet passes through an IP packet exchange point and the destination IP network and reaches another network node device where an integrated IP network header is removed from the integrated IP network packet to restore the sending IP packet which is then sent to a destination IP terminal;
wherein the address management table is referenced to select a destination IP network to which the IP packet is to be transferred and the IP packet is sent to the destination IP network, and the integrated IP network packet is passed through two or more IP networks of different communication companies within the destination IP network and through IP packet exchange points. - View Dependent Claims (2, 3, 4, 5)
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6. An integrated IP network including:
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a plurality of IP networks; and
a plurality of network node devices;
wherein the network node devices are each connected to one or more of the IP networks via communication circuits and have their network node-points connected to external terminals via communication circuits;
wherein the IP networks each include a dedicated domain name server;
the domain name servers each has a correspondence relationship between IP addresses of the external terminals and host names of the terminals;
upon receiving from an external source terminal an IP packet whose destination is one of the domain name servers, the network node device transfers the received IP packet to the destination domain name server;
the destination domain name server retrieves an IP address of a destination terminal corresponding to the host name of the destination terminal contained in the received IP packet and returns the IP packet containing the destination terminal'"'"'s IP address obtained to the external source terminal;
the source terminal generates a new IP packet having the destination terminal'"'"'s IP address obtained from the domain name server in the above procedure and sends the generated IP packet to the network node device;
the network node device-compares a source terminal address, a destination terminal address and a port number registered in the address management table with a source terminal address, a destination terminal address and a port number contained in the IP packet to find a record specifying a destination IP network to which the IP packet is to be sent, generates an integrated IP network packet by using the source network node-point address and the destination network node-point address contained in the detected record, and sends the generated integrated IP network packet to the destination IP network; and
the integrated IP network packet passes through the IP network and the IP packet exchange point and reaches another network node device where an integrated IP network header is removed from the integrated IP network packet to restore the sending IP packet which is then sent to the destination IP terminal;
wherein the address management table is referenced to select a destination IP network to which the IP packet is to be transferred and the IP packet is sent to the destination IP network, and the integrated IP network packet is passed through two or more IP networks of different communication companies within the destination IP network and through IP packet exchange points. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification