Atm network with a filtering table for securing communication

Details Atm network with a filtering table for securing communication Atm network with a filtering table for securing communication

H - Electricity

04

L

H04L 12/56 (2006.01) H04L 29/08 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2229652

In a communication system, a source node responds to a packet by transmitting a signaling message to an ATM network, containing source and destination network-layer addresses and source and destination transport-layer addresses of the packet. The ATM network includes a filtering table having a plurality of entries each storing source and destination network-layer addresses and source and destination transport-layer addresses. Upon receipt of the signaling message, the ATM network returns a grant indication message to the source node if contents of the received signaling message are identical to contents of one of the entries of the filtering table, and establishes a virtual connection between the source node and a destination node. The source node is responsive to the grant indication message for storing the network-layer addresses and transport-layer addresses of the received packet into a virtual connection management table, segments a subsequently received packet into cells and transmits the cells over the virtual connection if the packet contains addresses identical to the addresses stored in the virtual connection management table.

Dans un système de communication, un noeud source réagit à un paquet en transmettant à un réseau ATM un message de signalisation qui contient les adresses source et destination du paquet correspondant respectivement à la couche réseau et à la couche transport. Le réseau ATM contient une table de filtrage à plusieurs entrées; dans chaque entrée sont conservées les adresses source et destination correspondant aux couches réseau et transport. Lorsqu'il reçoit le message de signalisation, le réseau ATM retourne un message d'acquiescement au noeud source si le contenu du message de signalisation reçu est identique au contenu de l'une des entrées de la table de filtrage, et établit une connexion virtuelle entre le noeud source et un noeud destination. Le noeud source réagit au message d'acquiescement en mémorisant les adresses du paquet reçu correspondant à la couche réseau et à la couche transport dans une table de gestion de connexion virtuelle, segmente le paquet reçu ultérieurement en cellules et transmet ces dernières sur la connexion virtuelle lorsque le paquet contient des adresses identiques aux adresses conservées dans la table de gestion de connexion virtuelle.

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