Communications network dynamic addressing arrangement

• US 5,166,931 A
• Filed: 09/04/1990
• Issued: 11/24/1992
• Est. Priority Date: 09/04/1990
• Status: Expired due to Term

• Current Assignee: American Telephone & Telegraph Company (AT&T, Inc.)
• Original Assignee: AT&T, Inc.
• Inventors: Riddle, Guy G.
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Chin, Wellington
• Application Number:
  US07/576,820
• Time in Patent Office: 812 Days
• Field of Search: 370/94.1, 370/94.2, 370/85.13, 370/85.14, 370/60, 370/60.1, 370/85.1
• US Class Current: 370/401
• CPC Class Codes: H04L 12/462 LAN interconnection over a bridge based backbone
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04L 61/00 Network arrangements, protocols or services for addressing or naming
• CPC Class Codes: H04L 61/2514 between local and global IP addresses
• CPC Class Codes: H04L 61/2517 using port numbers
• CPC Class Codes: H04L 69/00 Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass networks security protocols H04L9/40; wireless communication networks H04W

Abstract

A facility is provided which obviates the need of administering network addresses in an internetwork composed of a plurality of networks by assigning to each network a common source address, rather than a unique network address. In addition, and when a connection is established between two of the networks, then, for the duration of the connection, each of those networks is dynamically associated with a respective second network address and a respective connection address, in which the connection address is used as a destination address. Accordingly, when one of the networks transmits a message to the other network, the internetwork identifies the proper connection as a function of the message destination address and then forwards the message to the intended recipient. In doing so, the internet changes the message source address to the second address associated with the one changes network and the message destination address to the second address associated with the other one of the two networks. Similarly, the source and destination addresses of a message received via the internet are respectively changed to the common address and associated connection address before the message is forwarded to the intended recipient.

Claims

1. A network addressing arrangement for use in an internetwork comprising

at least first and second networks forming said internetwork, said first and second networks being arranged to exchange messages with one another, each of said messages containing source and destination addresses,

means for assigning a common, first internetwork address to said first and second networks for use as a respective source address,

means, operative prior to the actual exchange of said messages, for dynamically assigning to said first and second networks respective second internetwork addresses, and

means, responsive to receipt of a message from said first network, for changing the source and destination addresses contained in said message respectively to the second internetwork address assigned to said first network and the second internetwork address assigned to said second network, and for then supplying the resulting message to said second network.

2. The arrangement set forth in claim 1 further comprising means, operative when said first and second networks discontinue exchanging messages with each other, for canceling said second internetwork addresses respectively assigned to said first and second networks.

3. An arrangement for assigning network addresses in an internetwork formed from a first network and a plurality of second networks, said networks requiring respective internetwork addresses in order to exchange messages with one another, said networks being associated with respective interconnected switching nodes, said arrangement comprising

means for assigning to each of said networks a first internetwork address common to said networks, and

means, contained in a node associated with said first network and operative responsive to a connection being established between said first network and one of said second networks, for dynamically associating said first network with a second internetwork address and associating said connection with a third internetwork address, for supplying said third internetwork address to said first network as the address of said one of said second networks, and for supplying said second internetwork address to a node associated with said one of said second networks as the internetwork address of said first network.

4. The arrangement set forth in claim 3 further comprising means, contained in the node associated with said first network and operative when said first and said one of said second networks discontinue exchanging messages with each other, for canceling said second and third internetwork addresses assigned to said first network.

5. The arrangement set forth in claim 3 further comprising means, contained in the node associated with said first network and operative responsive to receiving from said first network a message containing said common first internetwork address as a source address and containing said third internetwork address as a destination address, for changing said common first internetwork address to said second internetwork address and changing said third internetwork address to another second internetwork address associated with said one of said second networks as a result of establishing said connection, and for then forwarding the changed message to said one of said second networks via said connection.

6. The arrangement set forth in claim 5 wherein said means for changing includes means, operative responsive to receiving via said connection a message containing as said source address said another second internetwork address associated with said one of said second networks and containing as said destination address said second internetwork address associated with said first network, for changing said source and destination addresses to said third and common first internetwork addresses, respectively, and for forwarding the changed message to said first network.

7. The arrangement set forth in claim 3 wherein each of said switching nodes is a virtual circuit switch operative as an internetwork gateway and said connection is a virtual circuit connection.

8. A method of dynamically assigning network addresses in an internetwork composed of at least first and second networks arranged to exchange messages with one another, in which each of said messages contain source and destination addresses, said method comprising the steps of

assigning a first internetwork address to said first and second networks for use as as a common source address,

dynamically assigning to said first and second networks, just prior to the actual exchange of said messages, respective second internetwork addresses, and

responding to receipt of a message from said first network by changing the source and destination addresses contained in said message respectively to the second internetwork address assigned to said first network and second internetwork address assigned to said second network, and then supplying said message to said second network.

9. A method of assigning network addresses in an internetwork formed from a first network and a plurality of second networks, said networks requiring respective internetwork addresses in order to exchange messages with one another, said networks being associated with respective interconnected switching nodes, said method comprising the steps of

assigning a first common internetwork address to each of said networks,

responding to a connection established between said first network and one of said second networks by dynamically associating said first network with a second internetwork address and associating said connection with a third internetwork address, and then supplying said third internetwork address to said first network as the address of said one of said second networks, and

supplying said second internetwork address to a node associated with said one of said second networks as the internetwork address of said first network.

10. The method set forth in claim 9 further comprising the step of responding when said first and said one of said second networks discontinue exchanging messages with each other by cancelling said second and third internetwork addresses that were assigned to said first network.

11. The method set forth in claim 9 further comprising the step of responding to receiving from said first network a message containing said first common internetwork address as a source address and containing said third internetwork address as a destination address by changing said first common internetwork address to said second internetwork address assigned to said first network and changing said third internetwork address assigned to said first network to another second internetwork address assigned to said one of said second networks as a result of establishing said connection, and then forwarding the changed message to the node associated with said one of said second networks via said connection.

12. The method set forth in claim 11 wherein the step of responding and changing includes the step of responding to receipt via said connection a message containing as said source address said another second internetwork address and containing as said destination address said second internetwork address associated with said first network by changing said source and destination addresses to said third and common internetwork addresses, respectively, and then forwarding the changed message to said first network.