Network address translation gateway for local area networks...

Details Network address translation gateway for local area networks... Network address translation gateway for local area networks...

H - Electricity

04

L

H04L 29/02 (2006.01) H04L 9/00 (2006.01) H04L 12/66 (2006.01) H04L 29/06 (2006.01)

Patent

CA 2401103

A network address translation gateway (20) provides normal network translation for IP datagrams traveling from a local area network (10) using local IP addresses to an external network (30), but suspends source service address (port) translation when the port is reserved for a specific protocol, such as the ISAKMP "handshaking" protocol that is part of the IPSec protocol model (FIGs. 2 and 3). ISAKMP exchanges require both source and target computers to use the same service address (port). By providing a network interface that does not translate the source service address (port), this gateway enables the initiation and maintenance of secure, encrypted transmissions using IPSec protocol between a local area network using local IP addresses and servers on the internet.

Une passerelle de traduction d'adresses réseau (20) assure la traduction réseau normale de datagrammes IP circulant entre un réseau local d'entreprise (10) utilisant des adresses IP locales et un réseau externe (30), mais suspend la traduction des adresses de service sources (port) lorsque le port est réservé à un protocole spécifique, tel que le protocole de transfert ISAKMP faisant partie du modèle de protocole IPSec (Fig. 2 et 3). Pour les échanges ISAKMP, les ordinateurs sources et cibles doivent utiliser la même adresse de service (port). Grâce à une interface de réseau qui ne traduit pas l'adresse de service source (port), ladite passerelle permet le lancement et le maintien d'émissions chiffrées sûres, à l'aide du protocole IPSec, entre un réseau local d'entreprise utilisant des adresses IP locales et des serveurs sur Internet.

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