Hi guys. As the title says, i'm doing some tests with openvpn and a vps with 1gigabit port (both directions). My ISP connection has around 160Mbit in down and 20Mbit in up. If i launch a speedtest while the VPN is active (under Windows 10 1803 17133.1) i have very poor performance: at the beginning of my tests i was reaching a super slow speed: about 20mbit in down. After some research and tweaking with openvpn configurations i managed to reach about 40 mbit in down which is still not enough. There is absolutely something wrong so i continued with experiments: i decided to give a try to the connection between me and the vps without going through the vpn. In this scenario the result with iperf3 is super clear: the connection between me and the vps is capped at around 50mbit. After some other tests and research, i got a doubt and i decided to try everything under a linux distro. So i ran an ubuntu live session on the same pc client i was using before and, big surprise, everything work as expected: i can reach max speed (around 160Mbit) in both iperf3 and openvpn. So, finally, i realized that the problem is something under Windows 10 indeed. I already tried with different settings of Autotuning level under the tcp/ip settings with no luck: the max speed i can reach is always 50mbit. The strange thing is that if i try to download something else from the vps (with chrome for example with http) i can get full speed instead: the only problems seems to be with openvpn and iperf and seem to be connected. Any clue about this? p.s. I forgot to mention that the vps runs Ubuntu Linux version 16 LTS
Ethernet of course. Yes, this time i will wait for the 100% official one before install. They change something about tcp ip stack from 17133 to 17134?