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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[–] Flatfire@lemmy.ca 7 points 23 hours ago (1 children)

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?

[–] dividedby0@lemmy.dbzer0.com 3 points 23 hours ago (1 children)

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?

[–] Flatfire@lemmy.ca 2 points 2 hours ago (1 children)

Yes, you got it.

It's possible that however your ISP provided router is designed, it's got some hidden port forward configuration. If that router has an option typically referred to as "bridge mode", you could bypass its routing features altogether and use your own router instead.

ISPs often have clauses about using their residential internet for hosting servers or exposed services, and it's possible your has taken a different approach to mitigating traffic from those sources.

If you can, I'd recommend using your own router rather than what the ISP provides.

[–] dividedby0@lemmy.dbzer0.com 1 points 46 minutes ago* (last edited 46 minutes ago)

I can't buy a router at the moment, things are not easy, and with the holidays coming, it's even harder. I had a look to see how much would I be in for and it's very much outside my budget.

Thank you nonetheless, maybe it's something I will be able to afford at some point in the future.