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Cisco Intrusion Prevention System Sensor CLI Configuration Guide for IPS 7.2
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Chapter8 Configuring Event Action Rules
Configuring the Denied Attackers List
Adding Entries to the Denied Attacker List
To add a deny attacker entry to the list of denied attackers, follow these steps:
Step 1
Log in to the CLI using an account with administrator or operator privileges.
Step 2
Add a deny attacker entry with an IP address of 192.0.2.0.
sensor# deny attacker ip-address 192.0.2.0
Warning: Executing this command will add deny attacker address on all virtual sensors.
Continue? [yes]:
Step 3
Enter
yes
to add this deny attacker entry for all virtual sensors.
Step 4
Add a deny attacker entry to a specific virtual sensor.
sensor# deny attacker virtual-sensor vs0 ip-address 192.0.2.0
Step 5
Remove the deny attacker entry from the list.
sensor# no deny attacker ip-address 10.1.1.1
Warning: Executing this command will delete this address from the list of attackers being
denied by all virtual sensors.
Continue? [yes]:
Step 6
Enter
yes
to remove the deny attacker entry from the list.
Note
To immediately stop denying attackers, you must use the clear denied-attackers command to
clear the denied attackers list.
For More Information
For the procedure for clearing denied attackers permanently from the denied attackers list, see
Monitoring and Clearing the Denied Attackers List, page8-36.
Monitoring and Clearing the Denied Attackers List
Use the show statistics denied-attackers command to display the list of denied attackers. Use the clear
denied-attackers [virtual_sensor] [ip-address ip_address] command to delete the denied attackers list
and clear the virtual sensor statistics.
If your sensor is configured to operate in inline mode, the traffic is passing through the sensor. You can
configure signatures to deny packets, connections, and attackers while in inline mode, which means that
single packets, connections, and specific attackers are denied, that is, not transmitted, when the sensor
encounters them. When the signature fires, the attacker is denied and placed in a list. As part of sensor
administration, you may want to delete the list or clear the statistics in the list.
The following options apply:
•
virtual_sensor—(Optional) Specifies the virtual sensor whose denied attackers list should be
cleared.
•
ip_address—(Optional) Specifies the IP address to clear.