TRANSFER DEVICE, VIRTUAL NETWORK SYSTEM, TRANSFER SETTING AUTOMATIC SETTING METHOD, AND TRANSFER SETTING AUTOMATIC SETTING PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a transfer device, VLAN system, transfer setting automatic setting method, and transfer setting automatic setting program that can reliably secure security by reliably cutting off communication on a path where communication should be cut off while making it unnecessary for a user or a server manager to present his address to a manager of a wide area Ethernet (R) and for the manager of the wide area Ethernet (R) to perform setting additional work to the transfer device in the wide area Ethernet (R) including a plurality of VLANs.SOLUTION: A transfer device according to the invention autonomously changes setting such as addition and deletion of setting on the basis of the header information of a downlink frame which the transfer device transmits to a subscriber device in order to determine via which virtual network a received frame should be transferred to a destination address device among a plurality of virtual networks of a wide area network the transfer device belongs to.