Abstract: An SDN controller used in a network constructed with an SDN, the SDN controller causes a computer to function as an address information specifying processing unit which specifies, based on a global address of an illegal attack server received from a threat detection system, communication with the received global address among communication in the network, and specifies a local address of a communication partner of the global address in the specified communication, a terminal identification information specifying processing unit which specifies terminal identification information on a client terminal to which the specified local address is assigned, and a security processing unit which passes to an edge network device, based on the specified terminal identification information, a control instruction to perform predetermined control processing to communication of the client terminal.

Abstract: There is provided an information processing system using a controller and a switch, wherein the switch transmits a predetermined message to all controllers to be connected when it is determined that there is no flow entry for a packet from a terminal to be connected in a flow table, and the controller sets the flow entry for discarding the packet in the flow table of the switch with low priority when it is determined that the predetermined message received from the switch does not satisfy a predetermined condition.

Abstract: An SDN controller used in a network constructed with an SDN, the SDN controller causes a computer to function as an address information specifying processing unit which specifies, based on a global address of an illegal attack server received from a threat detection system, communication with the received global address among communication in the network, and specifies a local address of a communication partner of the global address in the specified communication, a terminal identification information specifying processing unit which specifies terminal identification information on a client terminal to which the specified local address is assigned, and a security processing unit which passes to an edge network device, based on the specified terminal identification information, a control instruction to perform predetermined control processing to communication of the client terminal.