Yesterday I changed my ISP to one that allows port forwarding. Today the port forwarding has been enabled by the company and I set it up on the router.

After enabling it, my download and upload speed dropped from peaks of 50 MiB/s and valleys of 4-6 MiB/s to a very stable 2 MiB/s. Nothing else has changed in my qBittorrent configuration. If I close the ports again, the speed goes back to normal. I checked if the ports were open on various websites and all of them show that they are forwarded.

I was looking forward to be able to port forward and connect with every possible peer for years, and today has been a big disappointment in that regard!

Has anyone else seen something like this and if so, can you point me to the right direction to fix the problem?

Edit: Thanks everyone for your time and your help! Still working on it, but it's heartwarming to be on the receiving end of the goodwill of this community.

Sometimes I love the internet!

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[–] LodeMike@lemmy.today 5 points 1 day ago (15 children)

Are you sure nothing else is changing? How long did you do these tests for?

[–] dividedby0@lemmy.dbzer0.com 3 points 1 day ago* (last edited 1 day ago) (14 children)

I'm completely sure! Yesterday it was running ok all day. Today, I port forwarded and left home for a couple hours, after coming home I checked the computer and saw the low speed. The first thing I did was think about what had changed and I closed the ports. The speed went up immediately. I tested it a couple more times with different ports and the same thing happened.

[–] LodeMike@lemmy.today 2 points 1 day ago (13 children)

What the fuck?

Maybe they meter incoming speed? Try running a speedtest using a web server or iperf3 or something.

[–] dividedby0@lemmy.dbzer0.com 1 points 1 day ago (1 children)

The speed test looks fine. Maybe they meter it as you say. Guess I'll have to contact them so they can explain wtf is happening to my connection.

[–] LodeMike@lemmy.today 2 points 18 hours ago (1 children)

How did you do the speed test? You need to have an open port on your side and another IP address outside your network.

[–] dividedby0@lemmy.dbzer0.com 2 points 13 hours ago (1 children)

Ah, I used the speedtest tool of cloudflare, ookla and openspeedtest. You are referring to https://iperf.fr/, right? When I get home I'll read how to do it properly!

[–] LodeMike@lemmy.today 1 points 10 hours ago

I am a Unix person I just get it from my distro:s package repository. I don't know if that URL is the correct address.

The steps are (simplified):

Get a server on your home IP (your seedbox will do) and a computer on the outside (you may prefer try a VPN) to stress test your connection.
Open a port to the machine at your house. Run iperf3 server on that port on that machine.
Connect to that machine from the one outside your home via a command which runs a speed test.
See results.

This specifically speedtests incoming connections to your IP address. Regular speedtests like fast.com, etc. Test outgoing. With the way TCP/IP works, your ISP can easily differentiate the two.

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