Appendix B Signature Engines

Regular Expression Syntax

•deny-attacker-inline (inline mode only)—Does not transmit this packet and future packets from the attacker address for a specified period of time.

Note This is the most severe of the deny actions. It denies the current and future packets from a single attacker address. Each deny address times out for X seconds from the first event that caused the deny to start, where X is the amount of seconds that you configured. You can clear all denied attacker entries with the clear denied-attackerscommand, which permits the addresses back on the network.

•modify-packet-inline (inline mode only)—Modifies packet data to remove ambiguity about what the end point might do with the packet.

Note The event action modify-packet-inline is part of the Normalizer engine. It scrubs the packet and corrects irregular issues such as bad checksum, out of range values, and other RFC violations.

Other Actions

Note IPv6 does not support the following event actions: request-block-host, request-block-connection, or request-rate-limit.

•request-block-connection—Requests the ARC to block this connection.

•request-block-host—Requests the ARC to block this attacker host.

•request-rate-limit—Requests the ARC to perform rate limiting.

•reset-tcp-connection—Sends TCP resets to hijack and terminate the TCP flow.

Regular Expression Syntax

Regular expressions (Regex) are a powerful and flexible notational language that allow you to describe text. In the context of pattern matching, regular expressions allow a succinct description of any arbitrary pattern.

Table B-3lists the IPS signature Regex syntax.

 

 

Table B-3

Signature Regular Expression Syntax

 

 

 

 

 

 

 

 

Metacharacter

 

Name

Description

 

 

 

 

 

?

 

Question mark

Repeat 0 or 1 times.

 

 

 

 

 

*

 

Star, asterisk

Repeat 0 or more times.

 

 

 

 

 

+

 

Plus

Repeat 1 or more times.

 

 

 

 

 

 

 

 

{x}

 

Quantifier

Repeat exactly X times.

 

 

 

 

 

 

 

 

{x,}

 

Minimum quantifier

Repeat at least X times.

 

 

 

 

 

.

 

Dot

Any one character except new line (0x0A).

 

 

 

 

 

 

 

 

[abc]

 

Character class

Any character listed.

 

 

 

 

 

 

 

 

 

 

 

 

 

Cisco Intrusion Prevention System Sensor CLI Configuration Guide for IPS 7.2

 

 

 

 

 

 

 

 

OL-29168-01

 

 

 

 

B-9

 

 

 

 

 

 

 

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Cisco Systems IPS4510K9 manual Other Actions, Name 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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