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Denial of Service A "denial-of-service" (DoS) attack is characterized by an explicit attempt by hackers to prevent legitimate users of a service from using that service. Enable DoS Prevention Whole System Flood: SYN > Packets/Second Whole System Flood: FIN > Packets/Second Whole System Flood: UDP > Packets/Second Whole System Flood: ICMP > Packets/Second Per-Source IP Flood: SYN > Packets/Second Per-Source IP Flood: FIN > Packets/Second Per-Source IP Flood: UDP > Packets/Second Per-Source IP Flood: ICMP > Packets/Second TCP/UDP PortScan Low High Sensitivity ICMP Smurf IP Land IP Spoof IP TearDrop PingOfDeath TCP Scan TCP SynWithData UDP Bomb UDP EchoChargen Enable Source IP Blocking > Block time (sec)