I am going to setup an IIS7 instance behind a load balancer. I would like all apps (PHP/ASP/Asp.net) to be able to see correct REMOTE_ADDR, and not the one of loadbalancer. Later on I'll use ARR, and would like to ensure the problem doesn't occur there too. Please advise.

We install Microsoft Application Request Routing on a server and we are using it as a reverse proxy server. All the url rewrite rules work, if we update the rule set with new rules everything still works but if we introduce or modify any rule that contains any IP condition and use REMOTE_ADDR as a variable...