Patent ID: 7787476

Claim:
A layer 2 switch network system that includes a terminal, comprising: a plurality of layer 2 switches including an edge switch that is located at an edge of a layer 2 switch network and serves as a wireless access point; and a temporary-MAC-address notifying unit that notifies the edge switch of a temporary MAC address allocated to the terminal, wherein the edge switch stores therein swap data which associates a temporary MAC address acquired from the temporary-MAC-address notifying unit with a real MAC address, and, based on the swap data, replaces a real MAC address of a source set in a MAC frame with a temporary MAC address of the source on receipt of the MAC frame, and replaces a temporary MAC address of a destination set in a MAC frame with a real MAC address of the destination to transmit the MAC frame the edge switch snoops a neighbor solicitation IP packet, and replaces the real MAC address of the source set in the MAC frame including the neighbor solicitation IP packet and the real MAC address of the source set in the neighbor solicitation IP packet with corresponding temporary MAC addresses, respectively, when the terminal transmits the neighbor solicitation IP packet, and the edge switch snoops a neighbor advertisement IP packet, and replaces the real MAC address of the source set in the MAC frame including the neighbor advertisement IP packet and a target real MAC address set in the neighbor advertisement IP packet with corresponding temporary MAC addresses, respectively, when receiving the neighbor advertisement IP packet from the terminal.