Here is a link that will help you setup a Server Publishing Rule to handle your situation.

http://www.microsoft.com/isaserver/techinfo/tips/serverpubrules.asp


>I need to grab the IP address of users requesting a page from a web site. The web site resides behind an ISA Server. Consequently, when I request the IP address using:
>
>strIP_Address = Request.ServerVariables("REMOTE_ADDR")
>
>I get the IP of the ISA Server. Does anyone have or know of a workaround for this? Thanks in advance, Tim