| abstract |
(57) [Abstract] [Purpose] An object is to provide an address management device and method capable of monitoring the presence of an unauthorized address management device and an unauthorized terminal device. [Structure] In an address management device that allocates a network layer address in response to a request from each node connected to a network, an address list that stores a network layer address and a data link layer address as a set, and a packet transmitted on the network Receiving means for receiving regardless of the destination, and at least a set of a network layer address and a data link layer address of a source node of the packet or a set of a network layer address and a data link layer address of a destination node from the received packet. It is characterized in that it is provided with an extracting means for extracting one of them and a determining means for determining whether or not the set of the extracted network layer address and data link layer address exists in the set stored in the address list. And |