Title:
INTERNET PROTOCOL FILTER
Document Type and Number:
WIPO Patent Application WO1997040610
Kind Code:
A3
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.
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Inventors:
WOOTTON BRUCE ANTHONY
COLVIN WILLIAM G
COLVIN WILLIAM G
Application Number:
PCT/CA1997/000269
Publication Date:
November 27, 1997
Filing Date:
April 23, 1997
Export Citation:
Assignee:
NORTHERN TELECOM LTD (CA)
International Classes:
H04L12/46; G06F13/00; H04L12/56; H04L12/66; H04L29/06; H04L29/12; (IPC1-7): H04L29/06
Foreign References:
| EP0465201A2 | 1992-01-08 |
Other References:
EGEVANG K AND FRANCIS P: "The IP Network Address Translator (NAT)", RFC1631, May 1994 (1994-05-01), INTERNET ENGINEERING TASK FORCE, USA, pages 1 - 10, XP002040992
STALLINGS W, INTERNET SECURITY HANDBOOK, 1995, MAIDENHEAD,ENGLAND, pages 27 - 37, XP002040993
STALLINGS W, INTERNET SECURITY HANDBOOK, 1995, MAIDENHEAD,ENGLAND, pages 27 - 37, XP002040993
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