Chapter 1 What’s New for FortiOS 5.2.1 : Security Profiles : Intrusion Protection System (IPS) : Adjusting Rate Based Signatures
  
Adjusting Rate Based Signatures
Setting for rate based IPS signatures can now be edited in the web-based manager as part of an IPS sensor. In each sensor, you can enable a selected list of rate based signatures and adjust threshold, duration, track by setting, action, and block duration.
Figure 26: Rate Based Signatures list