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IPS 
Anomaly
FortiGate-300A Administration Guide
01-28006-0092-20041105
 301
Configuring an anomaly
Each anomaly is preset with a recommended configuration. By default all anomaly 
signatures are enabled. You can use the recommended configurations or you can 
modify the recommended configurations to meet the needs of your network.
For more information on minimum, maximum, and recommended thresholds for the 
anomalies with configurable thresholds, see the FortiGate IPS Anomaly Thresholds 
and Dissector Values Technical Bulletin
Figure 149:Editing the portscan IPS anomaly
Figure 150:Editing the syn_fin IPS anomaly
Action
The action set for each anomaly. Action can be Pass, Drop, Reset, Reset 
Client, Reset Server, Drop Session, Clear Session, or Pass Session.
Modify
The Edit and Reset icons. If you have changed the settings for an anomaly, 
you can use the Reset icon to change the settings back to the 
recommended settings.
Name
The anomaly name.
Enable
Select the Enable box to enable the anomaly or clear the Enable box to 
disable the anomaly. 
Logging
Select the Logging box to enable logging for the anomaly or clear the 
Logging box to disable logging for the anomaly.
Action
Select an action for the FortiGate unit to take when traffic triggers this 
anomaly.
Pass
The FortiGate unit lets the packet that triggered the anomaly pass 
through the firewall. If logging is disabled and action is set to Pass, the 
anomaly is effectively disabled.
Drop
The FortiGate unit drops the packet that triggered the anomaly. Fortinet 
recommends using an action other than Drop for TCP connection based 
attacks.