How to Setup DMZ connection in ubuntu?

[Tory]

In our company we (I) have recently setup a Ubuntu Machine on an old Dimension 8300 to act as a download machine. The reason for this is alot of Tax websites Push word and excel documents through their website as the viewer needs it and we have our WatchGuard setup to block all downloads. So i created this Linux Box to be hooked up to the DMZ in order to have the ability to download these files among other things then scan them for viruses, then put them on a flash drive to let the person have it.

First i Setup VNC so i can remotely maintain this server without leaving my desk because i am Lazy, however it is still on our network so i am able to remote in.

Step Two was to set it up on the DMZ. So i thought easy enough just setup an IP, and preferred DNS for it and ill be done. Boy was i Wrong lol

So i need some advice on how i would go about Setting up a DMZ connection so i can document it, then i wont have to ask this question again.

Teach me Please

[Rubberman]

It depends upon the router/firewall in use. Without this information there isn't much to say. In any case, if this is to be an outwardly facing FTP server, don't DMZ it, but tunnel just the ports you need for FTP to that machine. It should have a static local IP address (don't use DHCP), and make sure your FTP server is robust and fully patched to avoid getting hit by malware scanners.