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Lesson 1
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ISA Server 2004 Enterprise Edition Overview
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12-9
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Array policies An array policy is a set of rules that is defined on the array level and is specific to the array. These rules include access rules, publishing rules, and policy elements, as well as array networks and other network objects.
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The array configuration displayed in ISA Server Manager is almost exactly the same as the configuration displayed in ISA Server Manager when connected to a computer running ISA Server 2004, Standard Edition. The only new item in the interface is a Servers container that lists all the servers in the array. However, many of the objects in an array have additional configuration options related to Enterprise Edition features such as NBL and CARP .
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Configuring Enterprise Networks
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When you create an enterprise network, the only configuration option you have is to configure the IP address range. For example, you can create an enterprise network named Internal that includes all the IP addresses that are internal to your organization, but you cannot configure options such as Web Proxy client or Firewall client settings. After you create the enterprise network, you can assign the network to an array-level network. The IP addresses assigned to an enterprise network cannot cross any security boundary, such as a firewall or a VPN connection. However, you can create an enterprise network that contains the IP addresses in a perimeter network (also known as a demilitarized zone, or DMZ), or the IP addresses for a remote site. When you install ISA Server, Enterprise Edition, several enterprise networks are created that act as placeholders for array-level networks of the same name. These enterprise networks cannot be explicitly used when creating array-level firewall policy rules. Instead, they are typically used in the enterprise policy. Any rule applied by the enterprise administrator to the predefined enterprise network will be applied to the arraylevel network of the same name. For example, an enterprise rule that allows HTTP access to the External network will be applied to the External network for each array. ISA Server includes the following predefined enterprise networks:
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Enterprise networks can be used in several different scenarios:
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Enterprise networks can be used to create enterprise-level rules. For example, you can create an enterprise network named Internal Network that includes all the IP addresses for computers on your network. Then you can create an enterprise-level
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12-10
12
Implementing ISA Server 2004, Enterprise Edition
rule that controls Internet access. This rule applies to any computer on any internal network. If you add an array, the rule would automatically apply to the internal network of that array, so long as it is within the IP address range of the enterprise network.
Enterprise networks enable communication between arrays. When an array s networks are defined as part of an enterprise network, ISA Server can recognize the communication between the networks as internal traffic. Otherwise, ISA Server will consider the request to be from an external source, and the request will be rejected by the ISA Server spoof-detection feature. Enterprise networks allow the enterprise administrator to manage the IP address space of the enterprise, so that if a network is added on one array, there is no need to configure every other array to recognize that new network. So long as the new network is in an enterprise network and the other arrays built their networks based on the IP ranges defined in the enterprise networks, the new network will be recognized by all the arrays in the enterprise. To enable this, the array administrator must define the array networks using the enterprise networks. For example, if there is an enterprise network called Internal Network, the array administrator can create an array network and choose the Internal Network enterprise network as the IP range for that array network.
Exam Tip If you configure an enterprise network that includes IP addresses that are not included in any array-level network, any traffic coming from those IP addresses is considered spoofed and the traffic will be blocked. All IP addresses must be defined in an array network, either explicitly or by assigning an enterprise network as the address range for the array network.
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