Chapter 13 Displaying and Capturing Live Traffic on an Interface

Capturing Live Traffic on an Interface

 

03:43:05.694402 IP (tos 0x10, ttl

64, id 55469,

offset 0, flags [DF], length:

292)

 

10.89.147.31.22 > 10.89.147.50.41805: P [tcp sum

ok] 1864:2104(240) ack 1 win 8576

 

<nop,nop,timestamp 44085169 226014950>

 

 

 

03:43:05.694521 IP (tos 0x10, ttl

64, id 55470,

offset 0, flags [DF], length:

292)

 

10.89.147.31.22 > 10.89.147.50.41805: P [tcp sum

ok] 2104:2344(240) ack 1 win 8576

 

<nop,nop,timestamp 44085169 226014950>

 

 

 

03:43:05.694690 IP (tos 0x10, ttl

64, id 53740,

offset 0, flags [DF], length:

52)

 

10.89.147.50.41805 > 10.89.147.31.22: . [tcp sum

ok] 1:1(0) ack 2344 win 11704

 

 

<nop,nop,timestamp 226014950 44085169>

 

 

 

03:43:05.694808 IP (tos 0x10, ttl

64, id 55471,

offset 0, flags [DF], length:

300)

 

10.89.147.31.22 > 10.89.147.50.41805: P [tcp sum

ok] 2344:2592(248) ack 1 win 8576

 

<nop,nop,timestamp 44085169 226014950>

 

 

Step 3

You can use the expression option to limit what you display, for example, only TCP packets.

Note As described in the TCPDUMP man page, the protocol identifiers tcp, udp, and icmp are also keywords and must be escaped by using two back slashes (\\).

sensor# packet display GigabitEthernet0/1 verbose

expression ip proto \\tcp

Warning: This command will cause significant performance degradation

 

tcpdump: listening

on ge0_1, link-type

EN10MB

(Ethernet), capture size

65535 bytes

03:42:02.509738 IP

(tos 0x10, ttl

64,

id 27743, offset 0, flags [DF],

length: 88)

10.89.147.31.22 > 64.101.182.54.47039: P

[tcp

sum

ok] 3449098782:3449098830(48) ack

3009767154 win 8704

 

 

 

 

 

 

 

03:42:02.509834 IP

(tos 0x10, ttl

64,

id 27744, offset 0, flags [DF],

length: 152)

10.89.147.31.22 > 64.101.182.54.47039: P

[tcp

sum

ok] 48:160(112) ack 1 win 8704

03:42:02.510248 IP

(tos 0x0, ttl 252, id

55922, offset 0, flags [none], length: 40)

64.101.182.54.47039 > 10.89.147.31.22: . [tcp

sum

ok] 1:1(0) ack 160 win 8760

03:42:02.511262 IP

(tos 0x10, ttl

64,

id 27745, offset 0, flags [DF],

length: 264)

10.89.147.31.22 > 64.101.182.54.47039:

P

[tcp

sum

ok] 160:384(224) ack

1 win 8704

03:42:02.511408 IP

(tos 0x10, ttl

64,

id 27746, offset 0, flags [DF],

length: 248)

10.89.147.31.22 > 64.101.182.54.47039:

P

[tcp

sum

ok] 384:592(208) ack

1 win 8704

03:42:02.511545 IP

(tos 0x10, ttl

64,

id 27747, offset 0, flags [DF],

length: 240)

10.89.147.31.22 > 64.101.182.54.47039:

P

[tcp

sum

ok] 592:792(200) ack

1 win 8704

Step 4 Display information about the packet file.

sensor# packet display file-info

Captured by: cisco:25579, Cmd: packet capture GigabitEthernet0/1

Start: 2003/02/03 02:56:48 UTC, End: 2003/02/03 02:56:51 UTC sensor#

Capturing Live Traffic on an Interface

Use the packet capture interface_name [snaplen length] [count count] [expression expression] command to capture live traffic on an interface. Only one user can use the packet capture command at a time. A second user request results in an error message containing information about the user currently executing the capture.

Caution Executing the packet capture command causes significant performance degradation.

 

Cisco Intrusion Prevention System Sensor CLI Configuration Guide for IPS 7.2

13-4

OL-29168-01

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Cisco Systems IPS4510K9 manual Capturing Live Traffic on an Interface, Display information about the packet file, 13-4
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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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