The DoS/DDoS attack (denial-of-service/distributed denial-of-service attack) consumes server resources and forces services to stop responding. The DoS/DDoS attack causes a server response block by forging request data at a volume that exceeds the server's handling capability, so normal user requests cannot get a response. The anti-DoS attack function of the Network Secure device can be divided into two parts according to the attack direction: Inbound attack protection and Outbound attack protection. This prevents DoS attacks from WAN to LAN and protects devices on the LAN from viruses or DoS attacks launched by using attack tools. You can add, delete, enable, disable, move up, move down, move, or refresh DDoS protection policies.