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Understanding the Types of Proxy Servers
Proxy servers handle traffic in different ways, depending on how they are configured. In
general, all proxy servers fall into one of three categories: forward proxy, transparent
proxy, or reverse proxy. A single server can hold more than one of these roles; the roles
simply refer to the type of proxying that the server handles, as follows:
. Forward proxy??”A forward proxy is a traditional proxy server that clients are aware
of and to which they send their web requests directly (rather than to the Internet).
This type of proxy requires some way for the client browser to be configured to
point directly to the proxy server.
. Transparent proxy??”A transparent proxy provides for proxy functionality, but is
invisible to the client workstation. A transparent proxy can be set up in ISA if the
web traffic from the workstations flows directly through the ISA server in some
fashion, such as when the ISA server acts as an edge firewall.
. Reverse proxy??”Reverse proxy refers to the proxy server??™s capability to handle
requests made from the Internet to internal web servers. One common reverse proxy
scenario would involve ISA handling all traffic sent to a publicly accessible Outlook
Web Access (OWA) server.
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