Understanding Packet Display and Capture

Chapter 13 Displaying and Capturing Live Traffic on an Interface

You can display or capture live traffic from an interface and have the live traffic or a previously captured file put directly on the screen. Storage is available for one local file only, subsequent capture requests overwrites an existing file. The size of the storage file varies depending on the platform. A message may be displayed if the maximum file size is reached before the requested packet count is captured.

Displaying Live Traffic on an Interface

Use the packet display interface_name [snaplen length] [count count] [verbose] [expression expression] command to display live traffic from an interface directly on your screen. Use the packet display iplog id [verbose] [expression expression] to display IP logs.

Note To terminate the live display, press Ctrl-C.

The following options apply:

•interface_name—Specifies the interface name, interface type (GigabitEthernet, FastEthernet, Management, PortChannel) followed by slot/port. You can only use an interface name that exists in the system.

•snaplen—(Optional) Specifies the maximum number of bytes captured for each packet. The valid range is 68 to 1600. The default is 0. A value of 0 means use the required length to catch whole packets.

•count—(Optional) Specifies the maximum number of packets to capture. The valid range is 1 to 10000.

Note If you do not specify this option, the capture terminates after the maximum file size is captured.

•verbose—(Optional) Displays the protocol tree for each packet rather than a one-line summary.

•expression—Specifies the packet-display filter expression. This expression is passed directly to TCPDUMP and must meet the TCPDUMP expression syntax.

Note The expression syntax is described in the TCPDUMP man page.

Note If you use the expression option when monitoring packets with VLAN headers, the expression does not match properly unless vlan and is added to the beginning of the expression. For example, packet display iplog 926299444 verbose expression icmp Will NOT show ICMP packets; packet display iplog 926299444 verbose expression vlan and icmp WILL show ICMP packets. It is often necessary to use expression vlan and on the IPS appliance interfaces connected to trunk ports.

•file-info—Displays information about the stored packet file. File-infodisplays the following information:

Captured by: user:id, Cmd: cliCmd

	Cisco Intrusion Prevention System Sensor CLI Configuration Guide for IPS 7.2
13-2	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 Understanding Packet Display and Capture, 13-2

Models: IPS4510K9