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When Microsoft Internet Security and Acceleration (ISA) Server 2006 receives a request for a published server, it determines whether the request is allowed, and then routes the request to the published server. For Web servers, by default, ISA Server does not pass the IP address of the original requesting client to the published server. Instead, ISA Server substitutes the original IP address that is specified in the packet, with its own IP address. As a result, all requests that are routed to the published server appear to have originated from the same IP address—that of the ISA Server computer.
For server publishing rules, ISA Server passes the IP address of the original requesting client to the published server.
Some applications require actual identification by the actual requesting client. When you publish these applications, you can configure ISA Server to forward requests with the IP address of the requesting (source) client.
You can configure how ISA Server passes the client's IP address. For instructions, see Configure proxy requests for a firewall policy rule.
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latest ISA Server content at ISA
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