I'm faced with a slight troublesome network configuration whereas I have to go through a double NAT solution. The deal is that I'm living with a shared Internet connection, but need to run my own separate subnet with my own IP-configurations and solutions. So basically I will have my pfSense server running from behind another router hosted by the house owner as we don't want to be on the same local network. This of course bring the trouble regarding double NATing and all the port forwarding nonsense that provides. UPNP and automatic port mapping wont work when double NATing and I thought the whole idea behind DMZ on a router was to get around issues like this. But after putting my pfSense server's WAN IP in our house owners router DMZ I'm still not seeing UPNP and automatic port forwarding, nor manually port forwarding working from my network like before we had double NAT? If DMZ is out of the question, how would one resolve the issues regarding double NATing and getting ports successfully following through the network? And what is exactly the point with a DMZ function in a router if not for issues like this?