Cisco IPS 7.1 Installation Guide download pdf (Page 20)

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Cisco Intrusion Prevention System Appliance Hardware Installation Guide for IPS 7.1

OL-24002-01

Chapter 1 Introducing the Sensor

How the Sensor Functions

• Filter out known false positives caused by specialized software, such as vulnerability scanner and

load balancers by one of the following methods:

–

You can configure the sensor to ignore the alerts from the IP addresses of the scanner and load

balancer.

–

You can configure the sensor to allow these alerts and then use the IME to filter out the false

positives.

• Filter the Informational alerts.

These low priority events notifications could indicate that another device is doing reconnaissance

on a device protected by the IPS. Research the source IP addresses from these Informational alerts

to determine what the source is.

• Analyze the remaining actionable alerts:

–

Research the alert.

–

Fix the attack source.

–

Fix the destination host.

–

Modify the IPS policy to provide more information.

For More Information

• For a detailed description of risk rating, refer to Calculating the Risk Rating.

• For information on Cisco signatures, for the IDM and IME refer to Defining Signatures, and for the

CLI refer to Defining Signatures.

• For detailed information on event action overrides, for the IDM and IME refer to Configuring Event

Action Overrides, and for the CLI, refer to Configuring Event Action Overrides.

Sensor Interfaces

This section describes the sensor interfaces, and contains the following topics:

• Understanding Sensor Interfaces, page 1-4

• Command and Control Interface, page 1-5

• Sensing Interfaces, page 1-6

• Interface Support, page 1-6

• TCP Reset Interfaces, page 1-11

• Interface Restrictions, page 1-12

Understanding Sensor Interfaces

The sensor interfaces are named according to the maximum speed and physical location of the interface.

The physical location consists of a port number and a slot number. All interfaces that are built-in on the

sensor motherboard are in slot 0, and the interface card expansion slots are numbered beginning with

slot 1 for the bottom slot with the slot numbers increasing from bottom to top (except for the

IPS 4270-20, where the ports are numbered from top to bottom). Each physical interface can be divided

in to VLAN group subinterfaces, each of which consists of a group of VLANs on that interface.

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Cisco IPS 7.1 Installation Guide Page 20

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