These little single-port routers have the ability to push the public IP address and all it’s traffic onto a single device connected to the LAN port.
To do this, set the router up as normal with the username and password for your connection, the only thing that you need to remeber to do is disable NAT, then logout from the web interface. You’ll now need to telnet to the device, and enter the following:
poe bridge switch on
ip dhcp enif0 server lease 120
After this, reboot the router. Once it boots up and logs into your ISP, you should find that it gives you a single IP address on DHCP and that address will be an external fully public IP address.