Appendix B Signature Engines

Master Engine

Table B-1

Master Engine Parameters (continued)

 

 

 

 

 

Parameter

 

Description

Value

 

 

 

specify-alert-interval

Enables the alert interval:

2 to 1000

{yes no}

 

• alert-interval—Specifies the time in seconds

 

 

 

 

 

 

before the event count is reset.

 

 

 

 

 

status

 

Specifies whether the signature is enabled or

enabled retired {yes

 

 

disabled, active or retired.

no}

 

 

 

 

obsoletes

 

Indicates that a newer signature has disabled an older

—

 

 

signature.

 

 

 

 

vulnerable-os-list

When combined with passive OS fingerprinting, it

aix

 

 

allows the IPS to determine if it is likely a given

bsd

 

 

attack is relevant to the target system.

general-os

 

 

 

hp-ux

 

 

 

ios

 

 

 

irix

 

 

 

linus

 

 

 

mac-os

 

 

 

netware

 

 

 

other

 

 

 

solaris

 

 

 

unix

 

 

 

windows

 

 

 

windows-ut

 

 

 

windows-nt-2k-xp

 

 

 

mars-category {yes

Maps signatures to a MARS attack category.1

—

no}

 

 

 

 

 

 

 

1.This is a static information category that you can set in the configuration and view in the alerts.Refer to the MARS documentation for more information.

Promiscuous Delta

The promiscuous delta lowers the risk rating of certain alerts in promiscuous mode. Because the sensor does not know the attributes of the target system and in promiscuous mode cannot deny packets, it is useful to lower the prioritization of promiscuous alerts (based on the lower risk rating) so the administrator can focus on investigating higher risk rating alerts. In inline mode, the sensor can deny the offending packets so that they never reach the target host, so it does not matter if the target was vulnerable. Because the attack was not allowed on the network, the IPS does not subtract from the risk rating value. Signatures that are not service, OS, or application-specific have 0 for the promiscuous delta. If the signature is specific to an OS, service, or application, it has a promiscuous delta of 5, 10, or 15 calculated from 5 points for each category.

Caution We recommend that you do NOT change the promisc-delta setting for a signature.

Cisco Intrusion Prevention System Sensor CLI Configuration Guide for IPS 7.2

 

B-6

OL-29168-01

 

 

 

Page 615 Page 617
Page 616
Image 616
Cisco Systems IPS4510K9 manual Promiscuous Delta
Page 615 Page 617

IPS4510K9 specifications

Cisco Systems has long been a leading player in network security, and its IPS (Intrusion Prevention System) series is a testament to its commitment to safeguarding digital environments. Among its notable offerings are the IPS4510K9 and IPS4520K9 models, both designed to provide advanced threat protection for mid-sized to large enterprise networks.

The Cisco IPS4510K9 and IPS4520K9 are distinguished by their cutting-edge features that help organizations defend against a myriad of cyber threats. These systems utilize a multi-layered approach to security, integrating intrusion prevention, advanced malware protection, and comprehensive visibility across the network.

One of the primary characteristics of the IPS4510K9 is its high performance. It boasts a throughput of up to 1 Gbps, making it suitable for environments that demand rapid data processing and real-time responses to threats. The IPS4520K9, on the other hand, enhances that capability with improved throughput of up to 2 Gbps, accommodating larger enterprises with heavier network traffic. These models are equipped with powerful processors that support complex signature matching and can intelligently distinguish between legitimate traffic and potential threats.

In addition to performance, both models are designed with scalability in mind. They can be easily integrated into existing Cisco infrastructures. This facilitates a seamless enhancement of security without causing significant interruptions to ongoing operations. Moreover, they offer flexible deployment options, allowing organizations to operate them inline or out of band depending on their specific needs.

The Cisco IPS4510K9 and IPS4520K9 leverage advanced detection technologies, utilizing a variety of signature types and heuristic analysis to detect known and unknown threats effectively. They are equipped with real-time alerting and reporting capabilities, giving security teams immediate visibility into potential breaches and enabling them to respond swiftly.

Furthermore, both models support a range of management options through the Cisco Security Manager, allowing for centralized administration, streamlined policy management, and enhanced monitoring capabilities. Automated updates ensure the systems remain current with the latest threat intelligence, vital for staying ahead of evolving cyber threats.

In summary, the Cisco Systems IPS4510K9 and IPS4520K9 represent powerful solutions for organizations seeking robust intrusion prevention capabilities. With their high performance, scalability, and advanced detection technologies, these systems are essential tools in the ever-changing landscape of cybersecurity, providing enterprises with the peace of mind needed to operate securely in today's digital world.
Top Page Image Contents