For More Information

Chapter 7 Defining Signatures

Configuring Signatures

2.Modify Packet Inline, Deny Connection Inline, and Deny Packet Inline have no effect on this signature.

3.The timer starts with the first SYN packet and is not reset. State for the session is reset and any subsequent packets for this flow appear to be out of order (unless it is a SYN).

4.Modify Packet Inline, Deny Connection Inline, and Deny Packet Inline have no effect on this signature.

5.The timer starts with the first FIN packet and is not reset. State for the session is reset and any subsequent packets for this flow appear to be out of order (unless it is a SYN).

6.Modify Packet Inline, Deny Connection Inline, and Deny Packet Inline have no effect on this signature.

7.Modify Packet Inline and Deny Packet Inline have no effect on this signature. Deny Connection Inline drops the current packet and the TCP session.

8.Phrak 57 describes a way to evade security policy using URG pointers. You can normalize the packet when it is in inline mode with this signature.

9.Modify Packet Inline strips the URG flag and zeros the URG pointer from the packet. Deny Connection Inline drops the current packet and the TCP session. Deny Packet Inline drops the packet.

10.Modify Packet Inline strips the selected option(s) from the packet. Deny Connection Inline drops the current packet and the TCP session. Deny Packet Inline drops the packet.

11.Modify Packet Inline strips the selected ACK allowed option from the packet. Deny Connection Inline drops the current packet and the TCP session. Deny Packet Inline drops the packet.

12.Modify Packet Inline strips the selected ACK allowed option from the packet. Deny Connection Inline drops the current packet and the TCP session. Deny Packet Inline drops the packet.

13.Modify Packet Inline strips the timestamp option from the packet. Deny Connection Inline drops the current packet and the TCP session. Deny Packet Inline drops the packet.

14.Modify Packet Inline strips the window scale option from the packet. Deny Connection Inline drops the current packet and the TCP session. Deny Packet Inline drops the packet.

15.Modify Packet Inline has no effect on this signature. Deny Connection Inline drops the current packet and the TCP connection. Deny Packet Inline drops the packet.

16.This signature is used to cause TTLs to monotonically decrease for each direction on a session. For example, if TTL 45 is the lowest TTL seen from A to B, then all future packets from A to B will have a maximum of 45 if Modify Packet Inline is set. Each new low TTL becomes the new maximum for packets on that session.

17.Modify Packet Inline ensures that the IP TTL monotonically decreases. Deny Connection Inline drops the current packet and the TCP session. Deny Packet Inline drops the packet.

18.Modify Packet Inline clears all reserved TCP flags. Deny Connection Inline drops the current packet and the TCP session. Deny Packet Inline drops the packet.

19.Modify Packet Inline has no effect on this signature. Deny Connection Inline drops the current packet and the TCP connection. Deny Packet Inline drops the packet.

20.2.4.21-15.EL.cisco.1 Modify Packet Inline raises the MSS value to TCP Min MSS. Deny Connection Inline drops the current packet and the TCP session. Deny Packet Inline drops the packet 2.4.21-15.EL.cisco.1.

21.Modify Packet Inline lowers the MSS value to TCP Max MSS. Deny Connection Inline drops the current packet and the TCP session. Deny Packet Inline drops the packet 2.4.21-15.EL.cisco.1.

22.Modify Packet Inline has no effect on this signature. Deny Connection Inline drops the current packet and the TCP session. Deny Packet Inline drops the packet.

23.Modify Packet Inline, Deny Connection Inline, and Deny Packet Inline have no effect on this signature. By default, the 1330 signatures drop packets for which this signature sends alerts.

24.These subsignatures represent the reasons why the Normalizer might drop a TCP packet. By default these subsignatures drop packets. These subsignatures let you permit packets that fail the checks in the Normalizer through the IPS. The drop reasons have an entry in the TCP statistics. By default these subsignatures do not produce an alert.

For more information about the Normalizer engine, see Normalizer Engine, page B-36.

Configuring TCP Stream Reassembly Signatures

To configure TCP stream reassembly for a specific signature, follow these steps:

Step 1 Log in to the CLI using an account with administrator or operator privileges.

Step 2 Enter signature definition submode.

	Cisco Intrusion Prevention System Sensor CLI Configuration Guide for IPS 7.2
7-36	OL-29168-01

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.

Cisco Systems IPS4510K9 manual Configuring TCP Stream Reassembly Signatures, For More Information

Models: IPS4510K9