Cisco Cisco Firepower Management Center 2000

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21-32
FireSIGHT System User Guide
 
Chapter 21      Managing Rules in an Intrusion Policy 
  Adding Alerts
You can specify a single IP address, address block, variable, or a comma-separated list comprised of any 
combination of these. For information on using IPv4 CIDR and IPv6 prefix length address blocks in the 
FireSIGHT System, see 
Step 9
Indicate the number of rule matches per time period to set the attack rate:
  •
In the 
Count
 field, using an integer between 1 and 2147483647, specify the number of rule matches 
you want to use as your threshold.
  •
In the 
Seconds
 field, using an integer between 1 and 2147483647, specify the number of seconds that 
make up the time period for which attacks are tracked.
Step 10
Select a 
New State
 radio button to specify the new action to be taken when the conditions are met:
  •
Select 
Generate Events 
to generate an event.
  •
Select 
Drop and Generate Events 
to generate an event and drop the packet that triggered the event in 
inline deployments or generate an event in passive deployments.
  •
Select 
Disabled 
to take no action.
Step 11
In the 
Timeout
 field, type the number of seconds you want the new action to remain in effect. After the 
timeout occurs, the rule reverts to its original state. Specify 
0
 or leave the 
Timeout
 field blank to prevent 
the new action from timing out. 
Step 12
Click 
OK
.
The system adds the dynamic rule state and displays a dynamic state icon (
) next to the rule in the 
Dynamic State column. If you add multiple dynamic rule state filters to a rule, a number over the icon 
indicates the number of filters.
If any required fields are left blank, you receive an error message indicating which fields you must fill.
Tip
To delete all dynamic rule settings for a set of rules, select the rules on the Rules page, then select 
Dynamic State > Remove Rate-Based States
. You can also delete individual rate-based rule state filters from 
the rule details for the rule by selecting the rule, clicking 
Show details
, then clicking 
Delete
 by the 
rate-based filter you want to remove.
Step 13
Save your policy, continue editing, discard your changes, or exit while leaving your changes in the 
system cache. See the 
 table for more information.
Adding Alerts
License: 
Protection
If you configure SNMP alerting for your FireSIGHT System, you can add an alert to specific rules in 
your intrusion policy. For more information, see 
Adding SNMP Alerts
License: 
Protection
If you configure an SNMP alert for your FireSIGHT System, you can configure rules within an intrusion 
policy to use that alert when traffic matches the rule and an event is generated.