Before You Begin in C#.NET

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Before You Begin
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This chapter presents the skills and concepts related to monitoring ISA Server 2004. If you plan to complete the practices and lab in this chapter, you should prepare the following:
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A Microsoft Windows Server 2003 (Standard Edition or Enterprise Edition) computer installed as DC1 and configured as a domain controller in the cohovineyard.com domain. A second Windows Server 2003 computer installed as ISA1 and configured as a domain member in the cohovineyard.com domain. Two network interfaces should be installed on this server. A Windows Server 2003 server installed as MAIL1. This server must be a member of the cohovineyard.com domain and have a default installation of Exchange Server 2003 on it. The Exchange server requires at least two mailboxes configured on it. A Microsoft Windows Server 2003 (Standard Edition or Enterprise Edition) computer installed as SERVER1. This computer should not be a member of the cohovineyard.com domain. This server should be located on the same network as the external interface of the ISA Server computer. This server should be running the DNS Service and the Domain Name System (DNS) client setting should be configured to use the server s Internet Protocol (IP) address as the DNS server.
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Lesson 1
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Planning a Monitoring and Reporting Strategy
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Lesson 1: Planning a Monitoring and Reporting Strategy
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ISA Server 2004 provides several monitoring options that can be accessed through the Microsoft ISA Server Management Console and through other administration tools on the server. This lesson provides an overview of what components can be monitored on ISA Server and how to design a monitoring and reporting strategy.
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After this lesson, you will be able to
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Describe why monitoring ISA Server is important List components that can be monitored on ISA Server Plan a monitoring and reporting strategy Implement ISA Server performance monitoring
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Estimated lesson time: 25 minutes
Why You Should Implement Monitoring
ISA Server is a critical component in an organization s network infrastructure. If ISA Server is deployed as an Internet-edge firewall, it operates as a firewall that secures the internal network. ISA Server may also be providing secure access to Internet resources for internal clients and access to specified internal resources for Internet clients. If ISA Server is not available, this functionality is disrupted. If ISA Server is being attacked from the Internet, the internal network may be at risk. There are many reasons for monitoring ISA Server. Some of these include the following:
Monitoring traffic flow between networks You must monitor traffic between networks to ensure that your access rules are correctly configured and that only the expected traffic passes through ISA Server. You also need to monitor ISA Server regularly to identify normal and legitimate traffic passing through the server. After you identify a typical traffic pattern, you can detect any variation that might indicate a potential problem. Troubleshooting network connectivity Monitoring ISA Server is a critical component of troubleshooting network connectivity. For example, if users report that they cannot access resources on the Internet, you can connect to ISA Server to help locate the problem. In this scenario, the problem might be with the client configuration, the ISA Server configuration, or the availability of the Internet resource. By monitoring ISA Server, you can begin troubleshooting by identifying the option most likely to be the source of the problem. Investigating attacks If ISA Server is operating as a firewall, it will inevitably be exposed to attacks from the Internet. If ISA Server is configured correctly, it can detect and block most attacks. However, even if ISA Server successfully blocks the
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Implementing Monitoring and Reporting
attacks, you should still be aware that the attacks are occurring and be aware of any variations in the normal attack patterns. If a new attack is launched against ISA Server, you must be alerted as quickly as possible that the attack is occurring so that you can determine how to respond to the attack. After the attack is finished, you should also have enough information logged on the ISA Server computer to investigate the attack. Even if the attack fails, investigate the attack pattern to detect possible patterns that may lead to additional attack attempts.
Planning By monitoring the computer running ISA Server, you can also gather information you can use for planning modifications to the current ISA Server infrastructure. By collecting performance data over a period of time, you can identify trends and use this information for planning future deployments of ISA Server.
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