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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[–] dividedby0@lemmy.dbzer0.com 2 points 8 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 5 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.