Syn

Chapter 7 Defining Signatures

Configuring Signatures

Table 7-6		TCP Stream Reassembly Signatures (continued)

				Parameter With
				Default Value and
Signature ID and Name			Description	Range	Default Actions

1309	TCP Reserved Flags Set		Fires when the reserved bits	TCP Idle Timeout	Modify Packet Inline
			(including bits used for ECN)	3600	Produce Alert18
			are set on the TCP header.

1311	TCP Packet Exceeds MSS		Fires when a packet exceeds the	TCP Idle Timeout	Produce Alert19
			MSS that was exchanged	3600
			during the three-way
			handshake.

1312	TCP MSS Below Minimum		Fires when the MSS value in a	TCP Min MSS 400	Modify Packet Inline20
			packet containing a SYN flag is	(0-16000)
			less that TCP Min MSS.	TCP Idle Timeout
				3600

1313	TCP Max MSS		Fires when the MSS value in a	TCP Max MSS1460	Modify Packet Inline
			packet containing a SYN flag	(0-16000)	disabled21
			exceed TCP Max MSS

1314	TCP Data SYN		Fires when TCP payload is sent	—	Deny Packet Inline
			in the SYN packet.		disabled22
1315	ACK Without TCP Stream		Fires when an ACK packet is	—	Produce Alert
			sent that does not belong to a		disabled23
			stream.

1317	Zero Window Probe		Fires when a zero window	Modify Packet Inline	Modify Packet Inline
			probe packet is detected.	removes data from the
				Zero Window Probe
				packet.

133024 0 TCP Drop - Bad Checksum			Fires when TCP packet has bad	Modify Packet Inline	Deny Packet Inline
			checksum.	corrects the
				checksum.

1330	1 TCP Drop - Bad TCP Flags		Fires when TCP packet has bad	—	Deny Packet Inline
			flag combination.

1330	2 TCP Drop - Urgent Pointer With		Fires when TCP packet has a	Modify Packet Inline	Modify Packet Inline
No Flag			URG pointer and no URG flag.	clears the pointer.	disabled

1330	3 TCP Drop - Bad Option List		Fires when TCP packet has a	—	Deny Packet Inline
			bad option list.

1330	4 TCP Drop - Bad Option Length		Fires when TCP packet has a	—	Deny Packet Inline
			bad option length.

1330	5 TCP Drop - MSS Option Without		Fires when TCP MSS option is	Modify Packet Inline	Modify Packet Inline
SYN			seen in packet without the SYN	clears the MSS
			flag set.	option.

1330	6 TCP Drop - WinScale Option		Fires when TCP window scale	Modify Packet Inline	Modify Packet Inline
Without SYN			option is seen in packet without	clears the window
			the SYN flag set.	scale option.

	Cisco Intrusion Prevention System Sensor CLI Configuration Guide for IPS 7.2
7-34	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 Syn

Models: IPS4510K9

TCP Stream Reassembly Signatures (continued)

OL-29168-01

IPS4510K9 specifications