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Rubi Shnol
Asked: 2017-11-23 13:08:22 +0800 CST

Proper port forwarding under Ubuntu

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What is the correct way to open ports in Ubuntu and use Transmission in active mode?

I opened port in my Technicolor 7200 router using this guide as follows:

enter image description here

Then, I opened a port via terminal:

sudo ufw allow 6881

But, when I check if port is open using this service, it says:

enter image description here

What I am doing wrong?

Also, how to do port forwarding if my external IP is dynamic? I am trying to open some ports to get Transmission working in active mode.

networking

1 Answers

  1. There are normally two steps in configuring port forwarding. Additional to what you have already done, the next step may be to add a firewall rule on your border router to permit the incoming traffic you are forwarding. Some systems do this automatically however that would be the first place I would look. The firewall rule should allow the destination port(s) you specified to hit the outside (internet) side interface.

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