FortiOS DDoS Prevention

FortiOS DDoS Prevention

In addition to using DoS protection for protection against DoS attacks, FortiOS includes a number of features that prevent the spread of Botnet and C&C activity. Mobile Malware or Botnet and C&C protection keeps Botnet and C&C code from entering a protected network and compromising protected systems. As a result, systems on the protected network cannot become Botnet clients.

Configuration options

In addition, FortiOS can monitor and block outgoing Botnet connection attempts. Monitoring allows you to find and remove Botnet clients from your network and blocking prevents infected systems from communicating with Botnet sites.

Configuration options

Choose the standard configuration for maximum protection or configure sniffer mode to gather information.

Standard configuration

DoS protection is commonly configured on a FortiGate unit that connects a private or DMZ network to the Internet or on a FortiWiFi unit that connects a wireless LAN to an internal network and to the Internet. All Internet traffic or wireless LAN traffic passes through DoS protection in the FortiGate unit or the FortiWiFi unit.

Out of band configuration (sniffer mode)

A FortiGate unit in sniffer mode operates out of band as a one-armed Intrusion Detection System by detecting and reporting attacks. It does not process network traffic nor does it take action against threats. The FortiGate interface operating in sniffer mode is connected to a Test Access Point (TAP) or a Switch Port Analyzer (SPAN) port that processes all of the traffic to be analyzed. The TAP or SPAN sends a copy of the switch traffic to the out of band FortiGate for analysis.

FortiOS records log messages and sends alerts to system administrators when a DoS attack is detected. IDS scanning does not affect network performance or network traffic if the IDS fails or goes offline.

DoS policies                                                                                Inside FortiOS: Denial of Service (DoS) Protection

DoS policies

DoS policies provide effective and early DoS detection while remaining light on system resources. They are configured to monitor and to stop traffic with abnormal patterns or attributes. The DoS policy recognizes traffic as a threat when the traffic reaches a user-configured packet rate threshold. The policy then determines the appropriate action. In addition to choosing whether or not to log each type of anomaly, you can choose to pass or block threats.

DoS policy anomaly protection is applied to all incoming traffic to a single FortiGate interface, but you can narrow policies by specifying service, source address, and destination address. The FortiGate unit processes DoS policies in their own respective order first, followed by all other firewall policies.

Hardware acceleration

Hardware acceleration enhances protection and increases the efficiency of your network. FortiOS integrated Content Processors (CPs), Network Processors (NPs), and Security Processors (SPs) accelerate specialized security processing. DoS SYN proxy protection is built in to NP6 processors and many Fortinet Security Processors, like the CE4, XE2, and FE8, to guard against TCP SYN floods. TCP packets with the SYN flag are the most efficient DoS attack tool because of how communication sessions are initiated between systems. NP6 and SP processors can offload TCP SYN flood attack detection and blocking. The SP module increases a FortiGate unit’s capacity to protect against TCP SYN flood attacks while minimizing the effect of attacks on the FortiGate unit’s overall performance and the network performance. The result is improved capacity and overall system performance.


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