C-19
Cisco Intrusion Prevention System Sensor CLI Configuration Guide for IPS 7.2
OL-29168-01
Appendix C Troubleshooting
When to Disable Anomaly Detection
When to Disable Anomaly Detection
If you have anomaly detection enabled and you have your sensor configured to see only one direction of
traffic, you should disable anomaly detection. Otherwise, you will receive many alerts, because anomaly
detection sees asymmetric traffic as having incomplete connections, that is, like worm scanners, and fires
alerts.
To disable anomaly detection, follow these steps:
Step 1
Log in to the CLI using an account with administrator privileges.
Step 2
Enter analysis engine submode.
sensor# configure terminal
sensor(config)# service analysis-engine
sensor(config-ana)#
Step 3
Enter the virtual sensor name that contains the anomaly detection p olicy you want to disable.
sensor(config-ana)# virtual-sensor vs0
sensor(config-ana-vir)#
Step 4
Disable anomaly detection operational mode.
sensor(config-ana-vir)# anomaly-detection
sensor(config-ana-vir-ano)# operational-mode inactive
sensor(config-ana-vir-ano)#
Step 5
Exit analysis engine submode.
sensor(config-ana-vir-ano)# exit
sensor(config-ana-vir)# exit
sensor(config-ana-)# exit
Apply Changes:?[yes]:
Step 6
Press Enter to apply your changes or enter
no
to discard them.
For More Information
To learn more about Worms, see Understanding Worms, page 9-2.