How to block any other service beside HTTP, IM and mail.

[micro80]

I wan't to block all other activity for the user to get access to services like on a web cafe (HTTP, IM & mail and so on).

I want to block things like P2P and other download program like Bittorrent.

How can I do that.

::)

[hoba]

The mainproblem is when trying to block anything but http is that lot's of IM Applications or P2P Apps switch to use port 80 if they can't get out on their default ports. You only might be able to cut this down by using a proxy. Try the squid package and configure it for transparent use. On top of that block anything going out but the desired ports.