Hitachi, Ltd.

Kazunari Hirayama

Minoru Koizumi

Makoto Kayashima

Masato Terada

Kazuo Nishimura

Takaaki Ogino

Takahiko Kawashima

Tetsuya Fujiyama

In view of providing a network system enabling communication having passed fire walls (repeaters) and assuring high security and operation flexibility through access control based on users and applications, a user-held table indicating correspondence between repeaters and passwords, a repeater-held table indicating correspondence between users and passwords and a table indicating access regions are defined respectively for users, departments of users and official positions of users and a route control information storing table indicating correspondence between networks and next transmitting destination is also provided to execute the access control for each user. Moreover, the repeater is provided with the repeating route control table so that a repeater located in the course of route to the transmitting destination computer and allowing communication from the transmitting side computer is selected from the data repeating control table and the process for requesting the repeating operation of communication with the destination is executed to the selected repeater.

Repeater and network system utililzing the same

Repeater and network system utilizing the same

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Yokohama, Japan

Kazunari Hirayama