| 摘要 |
When a packet to a terminal 111 is received from a terminal 110, a management communication processing unit 4 transmits by broadcasting or multicasting to a network 120 a destination information query packet for investigating a gateway device to which the terminal 111 is connected, receives from a gateway device 101 a destination information response packet for notifying that the terminal 111 is connected to the gateway device 101, and updates a terminal information storage table based on the destination information response packet. When the terminal information storage table is erased, the history information exchange unit 11 transmits by broadcasting or multicasting to the network 120 a history information query packet for requesting to re-notify of the terminal that has been notified in the destination information response packet, receives from the gateway device 101 a history information response packet for re-notifying of the terminal 111, and updates the terminal information storage table based on the history information response packet. |
