| 摘要 |
<p>Provided is a communication system wherein the relations of connections between the communication devices included in a communication network such as a LAN (Local Area Network) controlled by a router can be determined at low cost and without imposing excessive load on these communication devices. When a switching hub has received from a downstream port an ARP (Address Resolution Protocol) packet addressed to a router and requesting that the LAN be connected to an IP network, the switching hub adds tag information indicating the port to the ARP packet and forwards the packet. Further, when the router has received an ARP packet addressed to a device managed by the router, the router generates, from the tag information attached to the ARP packet, information indicating the relations of connections between the communication terminal which has transmitted the ARP packet and switching hubs which have forwarded the packet, and stores the generated information.</p> |
