A common web interface
The top picture is of a wondrously cheap router which uses a very common web admin interface. It lets you specify a range of incoming ports, but only one port to forward to. I'd imagine the latter is simply where the range starts, because you can't forward a group of ports to a single port. The lower picture is a somewhat friendly port forwarding page. It is in fact an Operating System called Clark Connect, used to turn an old computer into a router, rather than having to buy one. Expect to see a virtual server/ port forwarding page somewhere between the two on your router.
