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FortiDDoS uses a 100% heuristic/behavior-based method to identify threats compared to competitors that rely primarily on signature-based matching. Instead of using pre-defined signatures to identify attack patterns, FortiDDoS builds a baseline of normal activity and then monitors traffic against it. Should an attack begin, FortiDDoS sees this as an anomaly and then immediately takes action to mitigate it. You're protected from known attacks and from the unknown "zero-day" attacks as FortiDDoS doesn't need to wait for a signature file to be updated.
FortiDDoS also handles attack mitigation differently than other solutions. In other DDoS attack mitigation appliances, once an attack starts, it's 100% blocked until the threat is over. If an event is mistakenly matched to a signature creating a "false positive", then all traffic comes to a halt requiring intervention. FortiDDoS uses a more surgical approach by monitoring normal traffic and then using a reputation penalty scoring system, rates IP addresses that are "good" and others that are causing the problem.
FortiDDoS blocks the offending IP addresses then repeatedly reevaluates the attack at user defined periods (every 15 seconds by default). If the offending IP addresses continue to be a persistent threat for each of these reevaluation periods, their reputation penalty score will increase and will eventually be blacklisted once they hit a user-defined threshold.