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Decide the events to which you must be alerted in real time ISA Server can raise alerts based on almost any event that occurs. In most cases, you do not need to be apprised in real time about every alert. For example, if ISA Server blocks a single spoofing attack, you probably do not need to receive an alert. However, if the connection between ISA Server and a business-critical published Web server fails, you might decide that you must receive an alert. If you are using SMTP Message Screener, and suddenly the volume of e-mail passing through the message screener increases tenfold, you must be notified about this immediately to reduce the impact of a potential virus outbreak. Determine the threshold for the alert As part of deciding which events will raise alerts, you must also determine the threshold for when ISA Server will raise the alerts. If ISA Server detects hundreds of spoofing attacks within minutes, then you probably want to receive an alert. If a single VPN client fails to authenticate once, you are probably not interested. However, if the same client tries to authenticate many times, you may want to be alerted. Monitor ISA Server using the ISA Server Management Console and Performance Monitor You can also collect real-time information from ISA Server using the ISA Server Management Console and the Performance Monitor. In many cases, you might use these tools for real-time analysis only when a problem is reported. For example, if users report that the Internet connection is slower than usual, you can use these tools to determine why. If you use the Performance Monitor, use the preconfigured ISA Server Performance Monitor to monitor the most important counters on ISA Server.

Note Switches and routers between Computer Red and Computer Blue will simply forward the encrypted packets to their destination. However, a firewall or packet filtering router must be configured to allow IPSec traffic to pass.

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with cluster sizes greater than 4 KB, and can defragment the master file table. You can use the tools to defragment any local disk volume. But to schedule defragmentation, or to defragment a remote volume, you must look for a third-party tool such as Diskeeper from Executive Software. To use the built-in Disk Defragmenter, as shown in Figure 11-5, open the properties of a disk volume and, from the Tools tab, click Defragment Now. Alternatively, open the Disk Defragmenter snap-in in the Computer Management console or a custom Microsoft Management Console. Select a volume and click Analyze. The tool will dis play a recommendation. If the tool indicates that the volume is dirty, there may be cor ruption and CHKDSK should be run before defragmenting.

You can delegate ISA Server monitoring without allowing administrative access to the ISA Server configuration. If you assign users to the ISA Server Basic Monitoring role, they can view all the ISA Server monitoring information, but cannot change any settings. If you assign users to the ISA Server Extended Monitoring role, they can monitor the ISA Server computer, and change the monitoring configuration, but cannot modify other ISA Server settings such as access or publishing rules.

Creating an IPSec Policy is easy. Creating one that does exactly what you want it to is not always so easy. This far, you have learned how policy works. Now you will use that knowledge to create a simple policy that you can use to block access to port 80 and another to ensure encryption of data between two computers. The two major tools used to create policy are IP Security and Netsh. The next section describes how to cre ate a policy from the command line. The exercises at the end of this section teach you how to use the GUI tool and Netsh.

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Netsh is a native Windows Server 2003 command-line scripting tool that you can use to display or modify the local or remote network configuration of a computer running Windows Server 2003. You can run Netsh from a batch file or from the command prompt. The Netsh IPSec commands cannot be used on any other Windows computer.

If you are publishing internal resources to the Internet, you also need to configure DNS to resolve published resources. Details on how to configure this will be provided in 8.

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