SERVICE DISABLING ATTACK PROTECTING SYSTEM, SERVICE DISABLING ATTACK PROTECTING METHOD, AND SERVICE DISABLING ATTACK PROTECTING PROGRAM

摘要

The present invention includes a monitoring device (5) and a restricting device (6). The monitoring device (5) is provided on a LAN (2) and monitors a packet transmitted via an ISP network (4) to at least one communication device (3) connected to the LAN (2), and the restricting device (6) is provided on the ISP network (4) and restricts a packet to the LAN (2). The monitoring device (5) detects an attack by a packet on the communication device (3), and transmits protection request information indicating a request for protection against the attack detected, to the restricting device (6). The restricting device (6) restricts a packet transmitted to the communication device (3) via the ISP network (4), based on the protection request information.