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I have done port forwarding on my computer but I don't know how to test it. Can anyone help me? I have not done it using iptables but I have done it by following the instructions given in this link.

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You can also use web app for checking port forwarding: – Kenju Oct 21 '15 at 2:02
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If you have setup a port forward on your Ubuntu, you can test it by running port forwarding tests on websites specialized in this job. One of these is How to test port forwarding. It automatically detects your IP and you have to enter only your port you are about to test, and hit Check.



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I find websites like may not give the correct result if you don't have your server service running. On my Windows box, uttorrent says the port is open, but the website says it is closed. With ubuntu, you can use Transmission (often installed by default in Desktop version) to check ìf a port is open. The function used to check is in Edit/Preferences/Network.

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