Appendix B Signature Engines

Fixed Engine

Each Neighborhood Discovery type can have one or more Neighborhood Discovery options. The Atomic IPv6 engine inspects the length of each option for compliance with the legal values stated in RFC 2461. Violations of the length of an option results in an alert corresponding to the option type where the malformed length was encountered (signatures 1601 to 1605).

Note The Atomic IPv6 signatures do not have any specific parameters to configure.

For More Information

For more information on the parameters common to all signature engines, see Master Engine, page B-4.

Fixed Engine

The Fixed engines combine multiple regular expression patterns in to a single pattern matching table that allows a single search through the data. It supports ICMP, TCP, and UDP protocols. After a minimum inspection depth is reached (1 to 100 bytes), inspection stops. There are three Fixed engines: Fixed ICMP, Fixed TCP, and Fixed UDP.

Note The Fixed TCP and Fixed UDP engines use the service-ports parameter as exclusion ports. The Fixed ICMP engine uses the service-ports parameter as excluded ICMP types.

Table B-10lists the parameters specific to the Fixed ICMP engine.

Table B-10

Fixed ICMP Engine Parameters

 

 

 

 

 

Parameter

 

Description

Value

 

 

 

 

direction

 

Specifies the direction of traffic:

from-service

 

 

• Traffic from service port destined to

to-service

 

 

 

 

 

 

client port.

 

 

 

• Traffic from client port destined to

 

 

 

 

service port.

 

 

 

 

max-payload-inspect-length

Specifies the maximum inspection depth

1 to 250

 

 

for the signature.

 

 

 

 

 

regex-string

 

Specifies the regular expression to search

string

 

 

for in a single packet.

 

 

 

 

specify-exact-match-offset

(Optional) Enables exact match offset:

0 to 65535

{yes no}

 

•

exact-match-offset—Specifies the

 

 

 

 

 

 

 

exact stream offset the regex-string

 

 

 

 

must report for a match to be valid.

 

 

 

 

specify-min-match-length {yes

(Optional) Enables minimum match length:

0 to 65535

no}

 

•

min-match-length—Specifies the

 

 

 

 

 

 

 

minimum number of bytes the

 

 

 

 

regex-string must match.

 

 

 

 

 

 

 

Cisco Intrusion Prevention System Sensor CLI Configuration Guide for IPS 7.2

B-30

OL-29168-01

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Cisco Systems IPS4510K9 manual Fixed Engine
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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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