what I want to do it put a windows machine with IIS 6 & exchange 2000 installed on it behind a firewall. my problem being I want to allow incoming requests from port 80, port 21 and the exchange 2000(maybe upgrading to 2003) ports but block all the other requests from outside. the server needs to go behind a firewall that is currently in use for my home network which currently has 2 other windows machines behind it.
I dont want to install anyother software or change to using something like IPTables if it can be helped.
the firewall is setup at the moment and I dont really want to change any of the settings that will stop anything from the other machines. only open those ports to allow me to have a web/mail server behind the *nix firewall.