System and method for protecting from ddos, and storage media having program thereof

The present invention provides a distributed denial of service attacks, the corresponding system and method and a recording medium storing the program for controlling the network connection unit by detecting a distributed denial of service attacks. The invention, and the statistics DB which stores the traffic statistics, whether they are of one or more collecting traffic information from the network connection device to determine abnormalities and distributed denial of service is determined traffic abnormal attack connecting the network to this determined to provide a distributed denial of service attack response system that includes a corresponding server to apply the restrictions on the movement amount of traffic that a network connection device receives a distributed denial-of-service attacks. Accordingly, the present invention may correspond to a destruction system, and network resources lost by the underlying blocks to distributed denial of service attack in the middle stage of the backbone, it is possible to ensure the safe operation of the system.