Lesson 2 in Visual C#.NET

Generation QR Code JIS X 0510 in Visual C#.NET Lesson 2

Lesson 2
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Planning an ISA Server 2004 Enterprise Edition Deployment
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Generate QR Code JIS X 0510 In Visual Studio .NET
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Changing Your Configuration to Allow Workgroup Arrays You can modify the ISA Server domain or workgroup configuration after deployment. If you installed the Configuration Storage server without a certificate, you can modify the configuration to support workgroup arrays. To do this, obtain a server authentication certificate for each Configuration Storage server. Then associate the certificate with the appropriate service on the Configuration Storage server. You can do this in one of two ways:
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Rerun ISA Server setup. When you run ISA Server setup, select Repair on the Program Maintenance page. Then, select the option to deploy ISA Server in a workgroup and configure the service to use the server. Use ISACertTool to install the certificate and associate it with the Configuration Storage service. The ISACertTool is available as part of the ISA Server Resource Kit.
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Configuring the Front-End and Back-End Arrays
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When you deploy ISA Server, Enterprise Edition, in a back-to-back firewall configuration, you must plan the network configuration for the front-end and back-end arrays, and then configure both the front-end firewall array and the back-end firewall array. Plan the Array Network Configuration The first step in deploying a back-to-back firewall is to plan the ISA Server networks for both arrays. On the back-end array, the Internal network should include the IP addresses for all networks connected to the internal network interface on the ISA Server computer. The External network on the back-end array includes the IP addresses in the perimeter network, as well as the IP addresses on the Internet. Figure 12-2 illustrates how networks look from the perspective of the back-end array.
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On the back-end array, the Internal network includes just the IP addresses for the networks connected to the internal network interface. On the back-end array, the External network includes the IP addresses in the perimeter network, as well as the IP addresses on the Internet.
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Internal Network
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Perimeter Network
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F12im02
Figure 12-2
Defining the Internal and External addresses on the back-end array
On the front-end array, the Internal network always includes the IP addresses used in the perimeter network. If you use a NAT relationship between the perimeter network and the Internal network on the back-end array, the Internal network for the front-end array includes only the perimeter network IP addresses. If you define a
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Implementing ISA Server 2004, Enterprise Edition
route relationship between the perimeter network and the Internal network for the back-end array, the Internal network on the front-end array includes the perimeter network IP addresses and the back-end array Internal network IP addresses. On the frontend array, the External network includes just the Internet IP addresses. Figure 12-3 illustrates how networks look from the perspective of the front-end array.
On the front-end array, the Internal network includes the IP addresses for the perimeter network and the back-end array Internal network IP addresses, or just the IP addresses for the perimeter network.
On the front-end array, the External network includes just the IP addresses on the Internet.
Back-end Internal Network
Perimeter Network
F12im03
Figure 12-3
Defining the Internal and External addresses on the front-end array
Configuring the Front-End Array When configuring the front-end firewall array, consider the following guidelines:
Configure network routing If you define a route relationship between the perimeter network and the Internal network (as defined on the back-end array), the front-end array servers may need to be able to route network traffic to the servers on the back-end Internal network using the actual IP addresses of the servers. In this case, before installing ISA Server services on the front-end array servers, you should configure network routing. In most cases, the front-end array servers need to be configured to use a router connected to the Internet as its default gateway. This means that you must configure a static route on the ISA Server computers so that they can route incoming traffic to the back-end Internal network. If you use a NAT relationship between the perimeter network and the back-end Internal network, the front-end ISA Server computers can route all requests by using the IP address for a network adapter connected to the perimeter network on the back-end ISA Server computers, so no additional routing is required. Configure the network relationship You need to define a network relationship between the External network on the front-end array and the perimeter network. If you use private IP addresses for the perimeter network, you must configure a NAT relationship between the two networks. If you use public IP addresses for the perimeter network, you can define either a NAT or route relationship.
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