Appendix B Signature Engines

Meta Engine

Table B-13lists the parameters specific to the Flood Host engine.

Table B-13

Flood Host Engine Parameters

 

 

 

 

 

Parameter

 

Description

Value

 

 

 

 

protocol

 

Specifies which kind of traffic to inspect.

ICMP

 

 

 

UDP

 

 

 

 

rate

 

Specifies the threshold number of packets per second.

0 to 655351

icmp-type

 

Specifies the value for the ICMP header type.

0 to 65535

 

 

 

 

dst-ports

 

Specifies the destination ports when you choose UDP protocol.

0 to 655352

 

 

 

a-b[,c-d]

 

 

 

 

src-ports

 

Specifies the source ports when you choose UDP protocol.

0 to 655352

 

 

 

a-b[,c-d]

 

 

 

 

1.An alert fires when the rate is greater than the packets per second.

2.The second number in the range must be greater than or equal to the first number.

Flood Net Engine Parameters

Table B-14lists the parameters specific to the Flood Net engine.

Table B-14

Flood Net Engine Parameters

 

 

 

 

 

Parameter

 

Description

Value

 

 

 

 

gap

 

Specifies the gap of time allowed (in seconds) for a flood

0 to 65535

 

 

signature.

 

 

 

 

 

peaks

 

Specifies the number of allowed peaks of flood traffic.

0 to 65535

 

 

 

 

protocol

 

Specifies which kind of traffic to inspect.

ICMP

 

 

 

TCP

 

 

 

UDP

 

 

 

 

rate

 

Specifies the threshold number of packets per second.

0 to 655351

sampling-interval

Specifies the interval used for sampling traffic.

1 to 3600

 

 

 

 

icmp-type

 

Specifies the value for the ICMP header type.

0 to 65535

 

 

 

 

1. An alert fires when the rate is greater than the packets per second.

For More Information

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

Meta Engine

Caution A large number of Meta engine signatures could adversely affect overall sensor performance.

The Meta engine defines events that occur in a related manner within a sliding time interval. This engine processes events rather than packets. As signature events are generated, the Meta engine inspects them to determine if they match any or several Meta definitions. The Meta engine generates a signature event after all requirements for the event are met.

 

 

Cisco Intrusion Prevention System Sensor CLI Configuration Guide for IPS 7.2

 

 

 

 

 

 

 

OL-29168-01

 

 

B-33

 

 

 

 

 

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Cisco Systems IPS4510K9 Meta Engine, Protocol Specifies which kind of traffic to inspect, Flood Net Engine Parameters

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.

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