Internet protocol filter

H - Electricity – 04 – L

Patent

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Details

H04L 12/46 (2006.01) H04L 12/56 (2006.01) H04L 29/06 (2006.01) H04L 29/12 (2006.01)

Patent

CA 2248577

The IP filter (12), embodying the present invention, is a communications device designed to provide public network (14) or Internet (16) access to nodes (18) of private networks (10), 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.

Le filtre Internet Protocole (IP)(12), selon la présente invention, est un dispositif de communication conçu pour assurer un accès à Internet (16) ou des réseaux publics (14) à partir de noeuds (18) de réseaux privés (10), de manière avantageuse, sans nécessiter que les noeuds privés sur ces réseaux enregistrent leurs adresses sur Internet. Le filtre IP présente une seule adresse IP pour accéder à Internet, et utilise plusieurs ports IP pour résoudre le problème de la conservation des adresses IP. Il initie des sessions en affectant des sessions IP du côté privé à un port unique de l'adresse publique du filtre IP. Ce filtre effectue une traduction entre un numéro de port source pour le réseau privé et un numéro de port de destination pour le réseau public afin d'assurer la communication entre eux. Les avantages de ce filtre comprennent une sécurité de noeud privé et la conservation des adresses enregistrées sur Internet.

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