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How ISA Server Works as an Integrated Firewall, Proxy, and Caching Server
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In a small or medium organization, a single ISA Server computer may provide all Internet access functionality. The ISA Server computer is used to create a secure boundary around the internal network, and to provide Web proxy and caching services for internal users. Figure 1-6 shows an example of how ISA Server can be deployed as an integrated firewall, proxy, and caching server.
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E-Mail Server File Server Web Server ISP Server Web Server ISA Server Main Office Network Internet
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Figure 1-6 Deploying ISA Server as an integrated firewall, proxy, and caching server
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Explaining ISA Server Deployment Scenarios
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Small or medium-size organizations often have significantly different Internet access requirements than larger organizations. Small organizations may have dial-up or other slow connections to the Internet. Almost all organizations provide at least some level of Internet access to employees, but these offices may need to limit access because of the slow connections. Small organizations frequently do not require any services published to the Internet because their ISP may be hosting both their organization s Web site and their e-mail servers. Other organizations may have much more complex requirements, including requirements for SMTP, FTP, and HTTP server publishing as well as VPN access. Another unique situation faced by many small or medium-size organizations is that a single network administrator performs all network administration tasks. This means that the administrator is usually not a firewall or Internet security expert. ISA Server is flexible enough to meet almost any small or medium organization's requirements:
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Configuring caching on ISA Server computers means that Web pages are cached on the ISA Server hard disk. This can reduce the use of slow Internet connections or reduce the cost of a connection where cost is based on bandwidth usage. ISA Server supports the option of using dial-up connections to access the Internet or other networks. You can configure ISA Server to dial the connection automatically when a request is made for access to Internet resources. Installation of ISA Server is secure out of the box. By default, ISA Server 2004 will not accept any connections from the Internet after installation. This means that if the organization does not require any resources to be accessible from the Internet, the administrator does not need to configure ISA Server to block all incoming traffic. All the administrator has to do in this scenario is configure the server to enable Internet access for internal users and the configuration is complete. ISA Server provides network templates and server publishing wizards that can be used to configure most required settings. Configuring ISA Server to provide access to Internet resources can be as simple as applying a network template and using the wizard to configure the security settings. ISA Server provides several server publishing wizards that make it easy to securely publish internal servers to the Internet.
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How ISA Server Works as a Proxy- and Caching-Only Server
A final deployment scenario for ISA Server 2004 is as a proxy server and caching server only. In this scenario, ISA Server is not used to provide a secure boundary between the Internet and the internal network, but only to provide Web proxy and caching services. Figure 1-7 shows an example of how ISA Server can be deployed as a proxy- and caching-only server.
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Introduction to ISA Server 2004
E-Mail Server Web Server ISA Server
File Server
Web Server
Main Office Network Firewall Internet
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Figure 1-7 Deploying ISA Server as a proxy- and caching-only server
In most cases, computers running ISA Server are deployed with multiple network adapters to take advantage of ISA Server s ability to connect and filter traffic between multiple networks. However, if ISA Server is deployed as a Web proxy- and cachingonly server, it can be deployed with a single network adapter. When ISA Server is installed on a computer with a single adapter, it recognizes only one network the internal network. If an organization already has a firewall solution in place, it can still take advantage of the proxy and caching functionality of ISA Server. To deploy ISA Server as a proxy and caching server, you only need to configure it to allow users to access resources on the Internet. You would then configure the Web browsers on all client computers to use the computer running ISA Server as a Web proxy server. When you install ISA Server on a computer with a single adapter, the following ISA Server features cannot be used:
Firewall and SecureNAT clients Virtual private networking IP packet filtering Multi-network firewall policy Server publishing Application-level filtering
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