If you have setup a port forward on your linux box, you can test it by running port forwarding tests on websites specialized in this job. One of these is http://www.yougetsignal.com/tools/open-ports/. It automatically detects your ip and you have to enter only your port you are about to test, and hit Check.
How to test port forwarding
If you have setup a port forward on your linux box, you can test it by running port forwarding tests on websites specialized in this job. One of these is http://www.yougetsignal.com/tools/open-ports/. It automatically detects your ip and you have to enter only your port you are about to test, and hit Check.