I'm the VP of the Linux users group at the University of Delaware and we have several servers in the central data center connected to the university's subnet(12

I'm the VP of the Linux users group at the University of Delaware and we have several servers in the central data center connected to the university's subnet(128.4.0.0/16) with unfettered access to the general internet. No NAT, and limited firewall. Our Webserver is on a subdomain of the .edu(lug.udel.edu) and is totally accessible from the internet. It even listens for incoming connections. We run a mail server, a mirror, and an IRC server on there. It's great because even alumni can connect from wherever. I think there is a central firewall for every connection coming in, but I haven't run into problems for my uses. In fact, every system registered for an IP on the UD intranet is assigned a public, world-accessible IP on the 128.4.0.0/16 subnet and can listen for incoming connections. Even wireless devices.