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Title: US6128298: Internet protocol filter
[ Derwent Title ]

Country: US United States of America

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12 pages

Inventor: Wootton, Bruce Anthony; Raleigh, NC
Colvin, William G.; Milton, Canada

Assignee: Nortel Networks Corporation, Montreal, Canada
other patents from NORTEL NETWORKS LIMITED (769747) (approx. 2,727)
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Published / Filed: 2000-10-03 / 1997-04-24

Application Number: US1997000842328

IPC Code: Advanced: G06F 13/00; H04L 12/46; H04L 12/56; H04L 12/66; H04L 29/06; H04L 29/12;
IPC-7: H04L 12/56;

ECLA Code: H04L63/02D; H04L12/46B; H04L12/66; H04L29/12A; H04L29/12A4A1B; H04L29/12A4A1C; H04L61/25A1B; H04L61/25A1C; H04L63/02E;

U.S. Class: Current: 370/392; 370/390; 370/401; 726/014;
Original: 370/392; 370/390; 370/401; 713/201;

Field of Search: 370/351,352,355,389,390,392,393,400,401,402,409 395/200.6,200.62,200.68,200.72 713/201

Priority Number:
1997-04-24  US1997000842328
1996-04-24  US1996000015945P

Abstract:     The IP filter, embodying the present invention, is a communications device designed to provide public network or Internet access to nodes of private networks, advantageously without requiring the private nodes on such networks to register public Internet addresses. The IP filter presents a single IP address to the Internet and uses a plurality of IP ports to solve the problem of IP address conservation. It initiates sessions by assigning private side IP sessions to a unique port of the IP filter's public address. The IP filter effects a translation between a source port number for the private network and a destination port number for the public network for communication therebetween. Benefits of the IP filter include private node security and conservation of Internet-registered addresses.

Attorney, Agent or Firm: Foley & Lardner ;

Primary / Asst. Examiners: Patel, Ajit; Phunkulh, Bob A.

INPADOC Legal Status: Show legal status actions          Buy Now: Family Legal Status Report

Parent Case:     This application is based on provisional application 60/015,945 filed Apr. 26, 1996.

Designated Country: AU CA CN EP JP KR  DE FR GB 

Family: Show 14 known family members

First Claim:
Show all 32 claims
What is claimed is:     1. A method of interfacing private and public data communications networks, through a filter node in communication with both networks, the filter node having an address known in the public network, comprising the steps of:
  • routing from nodes in the private network, to the filter node, outgoing data packets having destination information, which includes a destination address and a destination port, corresponding to nodes in the public network and having source information, which includes a source address and a source port, of the respective private network nodes;
  • for each outgoing data packet received from the private network, at the filter node, maintaining the source information taken from the outgoing data packet in correlation with a unique value representing a port of the filter node, and replacing in the outgoing data packet the source address with the filter node address and the source port with the filter node port value; and
  • routing from the filter node, to nodes in the public network, the outgoing data packets having the replaced source information, according to the destination information in each, to the corresponding public network nodes.

Background / Summary: Show background / summary

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Description: Show description

Forward References: Show 147 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (147)   |   Backward references (10)   |   Citation Link

Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 16pp US5309437  1994-05 Perlman et al.  Digital Equipment Corporation Bridge-like internet protocol router
Get PDF - 6pp US5383179  1995-01 Saini et al.  Laboratoire Europeen de Recherches Electroniques Avancees Message routing method in a system having several different transmission channels
Get PDF - 10pp US5400334  1995-03 Hayssen  Ungermann-Bass, Inc. Message security on token ring networks
Get PDF - 25pp US5606668  1997-02 Shwed  Checkpoint Software Technologies Ltd. System for securing inbound and outbound data packet flow in a computer network
Get PDF - 19pp US5623601  1997-04 Vu  Milkway Networks Corporation Apparatus and method for providing a secure gateway for communication and data exchanges between networks
Get PDF - 8pp US5778174  1998-07 Cain  U S West, Inc. Method and system for providing secured access to a server connected to a private computer network
Get PDF - 12pp US5781550  1998-07 Templin et al.  Digital Equipment Corporation Transparent and secure network gateway
Get PDF - 22pp US5793763  1998-08 Mayes et al.  Cisco Technology, Inc. Security system for network address translation systems
Get PDF - 15pp US5826014  1998-10 Coley et al.  Network Engineering Software Firewall system for protecting network elements connected to a public network
Get PDF - 38pp US5835726  1998-11 Shwed et al.  Check Point Software Technologies Ltd. System for securing the flow of and selectively modifying packets in a computer network
Foreign References:
Publication Date IPC Code Assignee   Title
Get PDF - 18pp EP0465201 1992-01  H04L 12/46 DIGITAL EQUIPMENT CORPORATION Bridge-like internet protocol router 

Other Abstract Info: DERABS G1997-536173

Other References:
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