Intrusion Protection DoS sensors
FortiGate Version 4.0 MR1 Administration Guide
01-410-89802-20090903 545
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Figure 324: IPS Packet Log Viewer
5 Select the packet to view the packet in binary and ASCII. Each table row represents a
captured packet.
6 Select Save to save the packet data in a PCAP formatted file.
PCAP files can be opened and examined in network analysis software such as Wireshark.
DoS sensors
The FortiGate IPS uses a traffic anomaly detection feature to identify network traffic that
does not fit known or common traffic patterns and behavior. For example, one type of
flooding is the denial of service (DoS) attack that occurs when an attacking system starts
an abnormally large number of sessions with a target system. The large number of
sessions slows down or disables the target system so legitimate users can no longer use
it. This type of attack gives the DoS sensor its name, although it is capable of detecting
and protecting against a number of anomaly attacks.
You can enable or disable logging for each traffic anomaly, and configure the detection
threshold and action to take when the detection threshold is exceeded.
You can create multiple DoS sensors. Each sensor consists of 12 anomaly types that you
can configure. When a sensor detects an anomaly, it applies the configured action. One
sensor can be selected for use in each DoS policy, allowing you to configure the anomaly
thresholds separately for each interface. Multiple sensors allow great granularity in
detecting anomalies because each sensor can be configured for the specific needs of the
interface it is attached to by the DoS policy.
The traffic anomaly detection list can be updated only when the FortiGate firmware image
is upgraded.
Note: If virtual domains are enabled on the FortiGate unit, the Intrusion Protection settings
must be configured separately in each VDOM. All sensors and custom signatures will
appear only in the VDOM in which they were created.
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