| 摘要 |
PROBLEM TO BE SOLVED: To provide a realistic protection means for coping with DDoS attacks, which impair the quality of service to be offered by performing large quantity of access to a specific host server. SOLUTION: When footstool hosts 300 to 400 execute the DDoS attack as a large quantity of access to an attacking object host 1 by an instruction of an attack performance host 10, attack-detecting equipment 2 detects the attack by monitoring a state of a network 5 on the protecting side and communication control equipment 3 instruct communication control to attack shielding devices 100 to 200 by the instruction of a manager of the network on the protecting side 5, when the DDoS attack is detected by the attack detecting equipment 2. The footstool hosts 300 to 400 control communication, by receiving the instruction of communication control. In addition, certificate-issuing equipment 4 transmits information to assure the contents of the instruction of the communication control to the attack shielding devices 100 to 200.
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