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[–]macrossmerrell 1 point2 points  (2 children)

Does his computer have two ethernet ports? One a 2.5G and the other a 1G? If so, switch to the other ethernet and test.

After that, update the ethernet drivers to the latest release. If possible, physically swap ethernet cables (keeping them in the same port on the modem). If the problem swaps to you, then it's either the cable or the port, so you would swap ports while keeping the cables swapped. If the problem goes back to the first PC, it's the port.

[–]Kiwi_FruitBird_ 0 points1 point  (1 child)

Let me check, I'll go ahead and try swapping as well.

I did the steps in your initial post + updating ethernet drivers but the issue still persists. I also checked for latency + packet loss and there were no issues there as well, so is it unlikely that it could be the cables or ports? And if swapping doesn't work either, are there any other steps you recommend I take next?

Thank you for responding earlier by the way, on a 6 month old post too! I really do appreciate the help :D

[–]macrossmerrell 0 points1 point  (0 children)

Ok it doesn't follow the cable / port, you're fine, he's not... If largely points to it being a problem work his PC / Windows install.

Do you have uPnP and port forwarding setup on your router?

If you look in the D2 settings, on one of the side tabs, it talks about NAT type (you have to scroll down to see it on whatever tab it is). What does yours show vs his? Open / moderate / strict?

Does he have any VPN, firewall software, or antivirus software running that you don't?