Router, network system, and network setup method

摘要

A router facilitate a network setup including a Port No., and a network system employs the router. The router receives a transmission packet containing a MAC address broadcast from a terminal in a network. The router then relates the IP address and Port No. to the MAC address and store them as network information. The IP address and Port No. are different from those of a terminal already setup. This network information is sent by designating the MAC address. When a transmission packet designating Port No. of the terminal is received from an external network, the router forwards the transmission packet to the terminal whose Port No. stored matches the designated Port No.