Transfer device, communication system, and roundabout path detecting method

摘要

A transfer device that is installed in a unit network that includes a gateway includes a sending/receiving unit that sends/receives a frame to/from a transfer device that is installed in another unit network in a network that includes the unit network, a determining unit that determines, based on destination address or source address in a packet in the frame sent/received by the sending/receiving unit, whether the packet is related to communication between an internal device that is installed in the network and an external device that is installed outside the network, and a notifying unit that notifies, when the determining unit determines that the packet is related to the communication between the internal device and the external device, the external device of an instruction to switch a gateway.

主权项

1. A transfer device that is installed in a first unit network which has a gateway and is included in a plurality of unit networks that form a subnet, the transfer device comprising:
a sending/receiving unit that sends/receives a frame to/from another transfer device that is installed in a second unit network in the subnet; a determining unit that determines, based on destination address or source address in a packet in the frame sent/received by the sending/receiving unit, whether the packet is transferred between an internal device that is installed in the subnet and an external device that is installed outside the subnet; and a notifying unit that notifies, when the determining unit determines that the packet is transferred between the internal device and the external device, the external device of an instruction to switch a gateway.