Hitachi, Ltd.

Kazuo Orioka

Satoshi Miyazaki

Makoto Takahashi

Kazuo Yagyu

An LAN system provided with a host system connected to an LAN through a plurality of LAN adapters, and a plurality of terminal systems for communicating with the host system through the LAN. A plurality of logical addresses for the host system are set correspondingly to physical addresses of the LAN adapters. One of the logical addresses is selected arbitrarily as a key (common) logical address. When the host system is to send a message to one of the terminal systems, the host system sets the key logical address of the host system as a source logical address included in the message, selects one of the LAN adapters and sends the message to the LAN through the selected LAN adapter. When one of the terminal systems is to send a message to the host system, the terminal system sets the key logical address of the host system as a destination logical address included in the message, sets the physical address of the LAN adapter corresponding to the key logical address as a destination physical address included in the message and sends the message to the LAN.

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Chigasaki, Japan

Kazuo Orioka