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The detailed information required to plan ISA Server client implementation and deployment is discussed in 4, Installing and Managing ISA Server Clients.
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8. Plan for server publishing. Most organizations also publish some internal resources to the Internet. Because this allows network traffic from the Internet to your internal network, it is essential that the connection between the internal servers is as secure as possible.
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There are two components to planning server publishing. The first component is knowing what servers are going to be published and how to configure the publishing rules. The second component is a bigger question: How do you design the network connection to the Internet to ensure security Many organizations deploy servers that are accessible from the Internet in a perimeter network. This limits access between the perimeter network and the internal network. You need to choose a perimeter network configuration as part of the planning process.
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Planning for server publishing is discussed in more detail in 8, Implementing ISA Server Publishing.
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9. Plan for VPN deployment. ISA Server can operate as a VPN remote access server for external clients and as a VPN gateway for site-to-site VPNs. If you plan to deploy ISA Server in either configuration, include this in your planning. An extra level of planning is required if you choose to implement VPN network quarantine. With VPN network quarantine, you can restrict access to the internal network until the VPN clients pass a security configuration check. To perform the security configuration check, you must run a script or application on the client computer. The script can check for virtually any setting on the computer. In your planning, therefore, you must decide which security settings you will check on the client computer. This can be complicated. For example, you may decide that all clients that connect to your network must have an antivirus application installed, and that the virus detection files must be up to date. However, if you allow users to use any antivirus software, the script must check for all acceptable antivirus applications. The script that checks the security configuration on the client computer can become very complicated, so you must plan to have very competent scripting help available.
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Planning for VPN deployment is discussed in more detail in 10.
10. Plan the implementation. All your planning to this point has created a target state for your ISA Server implementation. The next step is to plan the actual implementation. How will you move your organization from where it is now to the target state The following components are involved in the implementation planning:
When you implement a new technology, you will almost always have an impact on the current environment, and you must define that impact. For example, when you deploy ISA Server, you may choose to deploy the Firewall Client to all client computers, or you may decide to implement new restrictions on what resources users can access on the Internet. Your deployment plan must identify all the ways that your implementation will affect the current environment. Whenever possible, strive to make the
Lesson 1
Planning an ISA Server Deployment
impact as transparent as possible; that is, your goal should be to minimize the impact on the users.
Define an implementation plan. At a high level, there are two possible scenarios for implementing a new technology. One option is to deploy the new technology alongside the existing technology and complete all your testing before switching to the new technology. This is the preferred implementation plan because it carries the least risk. If you deploy ISA Server for the first time in your organization, this is probably the best approach. The second deployment scenario is to upgrade the existing technology rather than create a parallel implementation. This is a typical approach when you upgrade an existing infrastructure. For example, if you upgrade from ISA Server 2000 to ISA Server 2004, you can install ISA Server 2004 servers and migrate most of the ISA Server 2000 configuration settings to the new servers. Regardless of which approach you use, your implementation plan should clearly define how the ISA Server computers will be deployed, and how the environment will be switched over to the new technology. Another important part of your planning is a user education plan. If the enduser experience will change as a result of the implementation, you must define a process for informing users. If the impact is minimal, you may be able to inform users with a simple e-mail. For example, if the only impact on users is that they will be limited in what resources or protocols they can use to access the Internet, then an e-mail explaining the differences, with a link to an intranet site that lists the organization s security policy, may be all that is required. If the impact is significant, you may need to plan more formal training. For example, if you implement a remote access VPN for the first time, you may need to provide training about how to install and configure the remote access VPN client. Test the implementation and conduct a pilot project. Before deploying a new technology into production, it is critical that you test and pilot the implementation. A test implementation is usually performed under strict restrictions. The initial test implementation should not affect any actual users. For example, perform the tests using test accounts from test client computers. If you use ISA Server to publish internal servers, the initial testing should not include a production server, but rather a test server. In most cases, a pilot implementation uses a small group of actual users to test the configuration. For example, you may choose a small group of users and reconfigure their default gateway or Web proxy configuration to point to the ISA Server computer for Internet access. You can then use this group of users to test the access rules. If you are piloting publishing, configure a publishing rule that will publish a non-critical server before publishing all the internal servers.
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