| 摘要 |
An IP address duplication monitoring device that performs monitoring for IP address duplication of a device to be monitored that is connected through a router and a network, when a LAN is connected with a network outside the LAN through a router provided with an ARP cache in which a set comprising an IP address and a lower layer address which is an address of a lower layer than the IP layer is held for a fixed period, and a device to be monitored, which is a device that provides a service to the network, is present in a LAN, the IP address duplication monitoring device having: a service request issuing section that sends a plurality of service requests to the device to be monitored; a service response analysis section that receives service responses obtained as a result of the service requests; and a monitoring section that generates an instruction for a service request to said service request issuing section at prescribed time intervals, that compares said plurality of service responses obtained from said service response analysis section and that makes a decision as to the existence of IP address duplication based on the results of this comparison.
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