| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology for detecting an IPSA false impersonation packet regardless of a connection form of a network.SOLUTION: A communication information detection device transmits detection information related to detected communication information to a transmission source address false impersonation determination device when the detected communication information is not communication information based on normal establishment of connection. The transmission source address false impersonation determination device aggregates collected detection information; makes any information processing device belonging to a network to which a second information processing device belongs acquire route information on a route to a transmission source address of the communication information about a connection from a first information processing device to the second information processing device, when the communication information included in the aggregated detection information is not communication information based on normal establishment of connection; and determines that the transmission source address of the communication information is false, when a result of the route information is not normal or a route shown by the route information is different from a transmission route from the first information processing device to the second information processing device. |
