Enable IPS - Click this setting to enable the Intrusion Prevention. After service is enabled, the next three checkboxes become available.
Select the checkboxes of the interface ports to monitor, WAN, LAN, or DMZ/WLAN/OPT. These three checkboxes become available when Enable IPS is checked.
Save - brings up a dialog box requesting more information about the schedule and persistence of the individual changes you have made.
Cancel - clears all the settings on the screen.