* Overview of Monitoring DHCP
* Multimedia: Creating a Performance Baseline (Optional)
* What Are DHCP Statistics?
* HowtoView DHCP Statistics
» What Is a DHCP Audit Log File? «> How DHCP Audit Logging Works
* How to Monitor DHCP Server Performance by Using the DHCP Audit Log
» Guidelines for Monitoring DHCP Server Performance
* Common Performance Counters for Monitoring DHCP Server Performance
* Guidelines for Creating Alerts for a DHCP Server
*****************************ILLEGAL FOR NON-TRAINER USE****************************** Introduction You can monitor DHCP by using the:
■ DHCP console for DHCP statistics.
■ DHCP audit log and Event Viewer for DHCP events.
■ Performance console for DHCP performance data.
Note For more information about using the Event Viewer to monitor DHCP events, please refer to Course 2274, Managing a Microsoft Windows Server 2003 Environment.
Lesson objectives After completing this lesson, you will be able to:
■ Explain the purpose of monitoring DHCP.
■ Explain what DHCP statistics are.
■ View DHCP statistics.
■ Explain what a DHCP audit log file is.
■ Describe how DHCP audit logging works.
■ Monitor DHCP server performance by using the DHCP audit log.
■ Apply guidelines for monitoring DHCP server performance.
■ Apply guidelines for common performance counters when monitoring DHCP server performance.
■ Apply guidelines for creating alerts for a DHCP server.
Overview of Monitoring DHCP
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Introduction Monitoring the DHCP service requires you to collect and view data about the
DHCP service. You need to monitor both the DHCP clients and the DHCP server. This module focuses on monitoring the DHCP server.
Why monitor DHCP? The DHCP environment is dynamic. Client needs are always changing as clients are added or removed, new options are configured, organizational needs change, and scopes are added to handle additional clients. Consequently, it is important to verify that the DHCP server is performing within expected norms on the network as the network changes.
Because of the importance of DHCP servers to the networking infrastructure, it is important to establish performance baselines that you can use when you are assessing server performance. These baselines are also valuable in the planning of changes and additions to the network.
Primary subsystems and Although it is important to monitor DHCP functions, it is just as important to the DHCP server understand that many servers that host the DHCP Server service also host other applications and network services. Consequently, when assessing performance, you should review the interaction of all services that run on the DHCP server and their respective utilization of system resources.
The DHCP service uses memory, processor, disk, and network subsystems. Although all of these subsystems are important for the DHCP service to perform optimally, you can obtain the greatest benefit by monitoring the performance of network subsystems.
Where can you find You can find DHCP data in DHCP statistics, DHCP events, and DHCP
DHCP data? performance data.
Tools for monitoring DHCP
Represent statistics collected at either the server level or the scope level since the DHCP service was started.
Any significant occurrence either in the system or in an application that requires users to be notified or an entry to be added to a log.
DHCP service start and ■ stop times
Number of IP addresses available in a scope
Number of leases in use in a scope
Number of clients in use
When the service was ■ stopped or started, and by ^ whom
DHCP service errors
DHCP service authorizations
DHCP audit log Event Viewer
DHCP performance data
The DHCP service includes a set of performance counters that the administrator can use to monitor various types of server activity.
Number of leases renewed for a period of time
Number of DHCPACK or DHCPNACK packets for a period of time
Amount of disk space that the DHCP database uses
Number of IP address conflicts
Note For more information about monitoring server performance by using the Event Viewer, refer to Course 2274, Managing a Microsoft Windows Server 2003 Environment
Multimedia: (Optional) Creating a Performance Baseline
* The objective of this presentation is to provide high-level steps for creating a performance baseline
* After this presentation, you will be able to:
Explain the purpose of a performance baseline
Explain that a performance baseline is the level of system performance that you find acceptable
Explain that server performance is critical to efficient network operations
To view the Creating a Performance Baseline presentation, open the Web page on the Student Materials compact disc, click Multimedia, and then click the title of the presentation.
After completing this presentation you will be able to:
■ Explain the purpose of a performance baseline.
■ Explain that a performance baseline is the level of system performance that you find acceptable.
■ Explain that server performance is critical to efficient network operations.
■ You should take samples of counter values every 30 to 45 minutes for a week, during peak, low, and normal operations.
■ The general steps for creating a baseline are:
• Identify resources
■ The four major system resources for performance baselines are:
• Physical disk
■ A performance object is the data that a system component or resource generates. Each performance object provides counters, which represent data about specific aspects of system performance.
What Are DHCP Statistics?
1 Houtír 17 Minulet, 5C Seeondi
Refresh \ If-Cióse |
DHCP statistics represent statistics collected at either the server ! level or scope level since the DHCP service was last started ^J
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Definition DHCP statistics represent statistics that are collected at either the server level or the scope level since the DHCP service was last started.
Purpose of DHCP Statistics provide a real-time view that you can use to check the status of your statistics DHCP server or scopes. These statistics can be provided either for a particular scope or at the server level; the latter shows the aggregate of all the scopes that the server manages
DHCP server and scope statistics
Using the DHCP console, you can view the DHCP statistics, for both a server and a scope, as listed in the following table.
Start Time When the DHCP service was X
Up Time Period of time the DHCP X
service has been active
Discovers Number of client X
Offers Number of client X
Requests Number of client X
Acks Number of client DHCPACKs X
Nacks Number of client X
Declines Number of client X
Releases Number of client X
Total Scopes Total number of scopes on the X
Total Addresses Total number of IP addresses X
configured for clients
In Use Number of IP addresses X
Available Number of IP addresses X
available for lease
How to View DHCP Statistics
Your instructor will demonstrate how to:
«• Enable DHCP statistics to automatically refresh «- View DHCP server statistics *> View DHCP scope statistics
ILLEGAL FOR NON-TRAINER USE
Procedure for enabling DHCP statistics to automatically refresh
Procedure for viewing DHCP server statistics
You can view DHCP statistics for both a server and a scope. For greater ease in viewing DHCP statistics, you can enable DHCP server statistics to refresh automatically, which also enables the DHCP scope statistics to refresh automatically.
Note It is recommended that you log on with an account that has nonadministrative credentials and use the Run as command with a user account that has appropriate administrative credentials to perform this task.
To enable DHCP statistics to automatically refresh:
1. In the DHCP console, in the console tree, select the appropriate DHCP server.
2. On the Action menu, click Properties.
3. On the General tab, select Automatically update statistics every, configure the Hours and Minutes fields appropriately, and then click oK.
To view DHCP server statistics:
1. In the DHCP console, in the console tree, select the appropriate DHCP server.
2. On the Action menu, click Display Statistics. To view DHCP scope statistics:
1. In the DHCP console, in the console tree, select the appropriate DHCP scope.
2. On the Action menu, click Display Statistics.
What Is a DHCP Audit Log File?
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