Handbook (PDF)

FortiDDoS is a network behavior anomaly (NBA) prevention system that detects and blocks network attacks that are characterized by excessive use of network resources, commonly referred to as distributed denial of service (DDoS) attacks. FortiDDoS uses a variety of schemes, including anomaly detection and statistical techniques, to provide nonstop protection, even against attacks cannot be recognized by an attack signature yet. It focuses on intent rather than content of network attacks. When it detects an intrusion, FortiDDoS immediately blocks traffic, thus protecting the systems it defends from being flooded.