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?
If I understand correctly, it sounds like you moved from an ISP that uses CGNAT to one that does not. Does your ISP provide a modem? If so, are you relying on the software features of that modem, or do you have a router inbetween?
You nailed the first part. As for the second one, you’ll have to be patient with me, because I’m not tech savvy and english is not my first language. Mi ISP provides a router, and through the router settings, you can port forward. Is that what you are asking?