Appendix B Signature Engines

Normalizer Engine

ASA IPS Modules and the Normalizer Engine

The majority of the features in the Normalizer engine are not used on the ASA 5500-X IPS SSP or ASA 5585-X IPS SSP, because the ASA itself handles the normalization. Packets on the ASA IPS modules go through a special path in the Normalizer that only reassembles fragments and puts packets in the right order for the TCP stream. The Normalizer does not do any of the normalization that is done on an inline IPS appliance, because that causes problems in the way the ASA handles the packets.

The following Normalizer engine signatures are not supported:

•1300.0

•1304.0

•1305.0

•1307.0

•1308.0

•1309.0

•1311.0

•1315.0

•1316.0

•1317.0

•1330.0

•1330.1

•1330.2

•1330.9

•1330.10

•1330.12

•1330.14

•1330.15

•1330.16

•1330.17

•1330.18

Table B-17lists the parameters that are specific to the Normalizer engine.

 

 

 

 

Table B-17

Normalizer Engine Parameters

 

 

 

 

 

 

 

 

 

 

 

Parameter

 

Description

 

 

 

 

 

 

 

 

 

 

edit-default-sigs-only

Editable signatures.

 

 

 

 

 

 

 

 

 

 

specify-fragment-reassembly-timeout

(Optional) Enables fragment reassembly timeout.

 

 

 

 

 

 

 

 

 

 

specify-hijack-max-old-ack

(Optional) Enables hijack-max-old-ack.

 

 

 

 

 

 

 

 

 

 

specify-max-dgram-size

(Optional) Enables maximum datagram size.

 

 

 

 

 

 

 

 

 

 

specify-max-fragments

(Optional) Enables maximum fragments:

 

 

 

 

 

 

• max-fragments—Lets you specify the number of

 

 

 

 

 

 

maximum fragments.

 

 

 

 

 

 

 

 

 

Cisco Intrusion Prevention System Sensor CLI Configuration Guide for IPS 7.2

 

 

 

 

B-38

 

 

 

 

OL-29168-01

 

 

 

 

 

 

 

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Cisco Systems IPS4510K9 manual ASA IPS Modules and the Normalizer Engine, Parameter Description
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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.
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