Chapter 8 Configuring Event Action Rules

Event Actions

Note There are other event actions that force a produce-alert. These actions use produce-alert as the vehicle for performing the action. Even if produce-alert is not selected or is filtered, the alert is still produced. The actions are the following: produce-verbose-alert, request-snmp-trap, log-attacker-packets, log-victim-packets, and log-pair-packets.

Note A produce-alert event action is added for an event when global correlation has increased the risk rating of an event, and has added either the deny-packet-inline or deny-attacker-inline event action.

•produce-verbose-alert—Includes an encoded dump of the offending packet in the alert. This action causes an alert to be written to the Event Store, even if produce-alert is not selected.

•log-attacker-packets—Starts IP logging on packets that contain the attacker address and sends an alert. This action causes an alert to be written to the Event Store, even if produce-alert is not selected.

•log-victim-packets—Starts IP logging on packets that contain the victim address and sends an alert. This action causes an alert to be written to the Event Store, even if produce-alert is not selected.

•log-pair-packets—Starts IP logging on packets that contain the attacker/victim address pair. This action causes an alert to be written to the Event Store, even if produce-alert is not selected.

•request-snmp-trap—Sends a request to the Notification Application component of the sensor to perform SNMP notification. This action causes an alert to be written to the Event Store, even if produce-alert is not selected. You must have SNMP configured on the sensor to implement this action.

Deny Actions

•deny-packet-inline (inline only)—Terminates the packet.

Note You cannot delete the event action override for deny-packet-inline because it is protected. If you do not want to use that override, set the override-item-status to disabled for that entry.

•deny-connection-inline (inline only)—Terminates the current packet and future packets on this TCP flow.

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

•deny-attacker-service-pair-inline (inline only)—Does not transmit this packet and future packets on the attacker address victim port pair for a specified period of time.

•deny-attacker-inline (inline only)—Terminates the current packet and future packets from this attacker address for a specified period of time.

The sensor maintains a list of attackers being denied by the system. To remove an entry from the denied attacker list, you can view the list of attackers and clear the entire list, or you can wait for the timer to expire. The timer is a sliding timer for each entry. Therefore, if attacker A is being denied, but issues another attack, the timer for attacker A is reset and attacker A remains in the denied attacker list until the timer expires. If the denied attacker list is at capacity and cannot add a new entry, the packet is still denied.

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

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Cisco Systems IPS4510K9 manual Deny Actions
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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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