Correcting the Time on the Sensor

Chapter 1 Introducing the Sensor

Time Sources and the Sensor

Verifying the Sensor is Synchronized with the NTP Server

In the Cisco IPS, you cannot apply an incorrect NTP configuration, such as an invalid NTP key value or ID, to the sensor. If you try to apply an incorrect configuration, you receive an error message. To verify the NTP configuration, use the show statistics host command to gather sensor statistics. The NTP statistics section provides NTP statistics including feedback on sensor synchronization with the NTP server.

To verify the NTP configuration, follow these steps:

Step 1	Log in to the sensor.
Step 2	Generate the host statistics.
	sensor# show statistics host
	...
	NTP Statistics
	remote	refid	st t when poll reach					delay	offset	jitter
	11.22.33.44	CHU_AUDIO(1)	8	u	36	64	1	0.536	0.069	0.001
	LOCAL(0)	73.78.73.84	5	l	35	64	1	0.000	0.000	0.001

ind assID status			conf reach auth condition				last_event cnt
1	10372	f014	yes	yes	ok	reject	reachable	1
2	10373	9014	yes	yes	none	reject	reachable	1

status = Not Synchronized

...

Step 3 Generate the hosts statistics again after a few minutes.

sensor# show statistics			host
...
NTP Statistics
	remote			refid		st t when poll reach					delay	offset	jitter
*11.22.33.44			CHU_AUDIO(1)			8	u	22	64	377	0.518	37.975	33.465
LOCAL(0)			73.78.73.84			5	l	22	64	377	0.000	0.000	0.001
ind assID status			conf reach auth condition						last_event		cnt
1	10372	f624	yes	yes	ok		sys.peer		reachable		2
2	10373	9024	yes	yes	none			reject	reachable		2

status = Synchronized

Step 4 If the status continues to read Not Synchronized, check with the NTP server administrator to make sure the NTP server is configured correctly.

If you set the time incorrectly, your stored events will have the incorrect time because they are stamped with the time the event was created. The Event Store time stamp is always based on UTC time. If during the original sensor setup, you set the time incorrectly by specifying 8:00 p.m. rather than 8:00 a.m., when you do correct the error, the corrected time will be set backwards. New events might have times older than old events.

For example, if during the initial setup, you configure the sensor as central time with daylight saving time enabled and the local time is 8:04 p.m., the time is displayed as 20:04:37 CDT and has an offset from UTC of -5 hours (01:04:37 UTC, the next day). A week later at 9:00 a.m., you discover the error: the clock shows 21:00:23 CDT. You then change the time to 9:00 a.m. and now the clock shows 09:01:33 CDT. Because the offset from UTC has not changed, it requires that the UTC time now be 14:01:33 UTC, which creates the time stamp problem.

	Cisco Intrusion Prevention System Appliance and Module Installation Guide for IPS 7.1
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IPS4520K9 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 IPS4520K9 manual Verifying the Sensor is Synchronized with the NTP Server

Models: IPS4520K9

Verifying the Sensor is Synchronized with the NTP Server

Log in to the sensor.

Generate the host statistics.

sensor# show statistics host

LOCAL(0)

Step 3 Generate the hosts statistics again after a few minutes.

Correcting the Time on the Sensor

OL-24002-01

IPS4520K9 specifications