NETWORK CONNECTION GATEWAY, A NETWORK ISOLATION METHOD AND A COMPUTER NETWORK SYSTEM USING SUCH A GATEWAY

摘要

The present invention manages session information of a packet and manipulates a departure address and a destination address in the session address so that a perfect transparency, in which an external network and an internal network are physically separated but shown as a one network to a user can be provided. A network connection gateway of the present invention includes an external network gateway server and an internal network gateway server, which are connected to a non-standard network cable through a non-compatible protocol. Each of the external network gateway server and the internal network gateway server includes a packet manipulation part to alter the departure address and the destination address, and a session management part to manage/construct a session between application hierarchies.