TCP Reset Not Occurring for a Signature

Appendix E Troubleshooting

Troubleshooting the Appliance

TCP Reset Not Occurring for a Signature

If you do not have the event action set to reset, the TCP reset does not occur for a specific signature.

Note TCP Resets are not supported over MPLS links or the following tunnels: GRE, IPv4 in IPv4, IPv6 in IPv4, or IPv4 in IPv6.

To troubleshoot a reset not occurring for a specific signature, follow these steps:

Step 1 Log in to the CLI.

Step 2 Make sure the event action is set to TCP reset.

sensor# configure terminal

sensor(config)# service signature-definition sig0 sensor(config-sig)#signatures 1000 0 sensor(config-sig-sig)#engine atomic-ip

sensor(config-sig-sig-ato)# event-actionreset-tcp-connectionproduc-alertsensor(config-sig-sig-ato)# show settings

atomic-ip

-----------------------------------------------

event-action: produce-alertreset-tcp-connection default: produce-alert

fragment-status: any <defaulted> specify-l4-protocol

-----------------------------------------------

specify-ip-payload-length

-----------------------------------------------

specify-ip-header-length

-----------------------------------------------

specify-ip-tos

-----------------------------------------------

--MORE--

Step 3 Exit signature definition submode.

sensor(config-sig-sig-ato)# exit sensor(config-sig-sig)# exit

sensor(config-sig)# exit Apply Changes:?[yes]:

Step 4 Press Enter to apply the changes or type no to discard them.

Step 5 Make sure the correct alarms are being generated.

sensor# show events alert

evAlert: eventId=1047575239898467370 severity=medium

originator: hostId: sj_4250_40

appName: sensorApp

	Cisco Intrusion Prevention System Appliance and Module Installation Guide for IPS 7.1
E-50	OL-24002-01

IPS4520K9 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.

Cisco Systems IPS4520K9 manual TCP Reset Not Occurring for a Signature, Sensor# show events alert

Models: IPS4520K9

TCP Reset Not Occurring for a Signature

--MORE--

Step 3 Exit signature definition submode.

sensor# show events alert

OL-24002-01

IPS4520K9 specifications