Evaluation system

An evaluation system comprising a gateway device, a first control device, and a second control device,

• wherein the gateway device includes:
• a first communication unit for receiving a packet from the first control device;
• a packet copying unit for copying the packet received in the first communication unit and transmitting to the gateway device and to the policy evaluation device;
• a first policy storage unit in which the policy is stored;
• a first filtering processing unit for performing a first filtering process on the copied packet based on the policy stored in the first policy storage unit;
• a first communication unit for transmitting the packet that has passed through the first filtering process by the first filtering processing unit, to the second control device;
• a first filter log storage unit in which the result of the first filtering process by the first filtering processing unit is stored;
• a second policy storage unit in which the policy is stored;
• a second filtering processing unit for performing a second filtering process on the copied packet based on the policy stored in the second policy storage unit;
• a second filter log storage unit in which the result of the second filtering process by the second filtering processing unit is stored;
• and
• a policy evaluation unit for evaluating the policy stored in the second policy storage unit, based on the result of the first filtering process stored in the first filter log storage unit, and based on the result of the second filtering process stored in the second filter log storage unit.