Slow Speed

v3ng

Hi,

I am running an OpenVPN server on my KVM Server, which I installed using the Nyr Openvpn-install script.
The VPN itself is running great, but I have a problem with the speed of it.
The speed varies a lot, sometimes I can reach 170 Mbps without any problems, but sometimes only 5Mbps.
It tested it using the following mirrors: tele2, Linode and digitalocean.
I couldn't figure out what the speed depends on.
I tried setting sndbuf and rcvbuf to a fixed value, but the speed still varies a lot.
Anybody have an idea?

MTU-Test Log: https://pastebin.com/DGw545jV
Client.conf: https://pastebin.com/tjRXrhdw
Server.conf: https://pastebin.com/MryRtwzY
Used Installer: https://github.com/Nyr/openvpn-install

TinCanTech

Don't use this --auth SHA512 ..

:roll:

See --auth in The Manual v24x

v3ng

Hi,

Thank you, but does this also affect the speed?

TinCanTech

It sure does.. that is why the default is SHA1 ..

v3ng

I have adapted it accordingly, but the real problem is, that sometimes I can reach the maximum bandwith without any problems and other times just a fraction of it. So it varies widely. My connection isn't the problem, I have always 160+ Mbit/s.

TinCanTech

Maybe you have an OpenVPN problem ..

See your OpenVPN log files at --verb 4 and look for errors or disconnections.

See --log & --verb in The Manual v24x

Also, a *-GCM cipher is more efficient than --cipher AES-256-CBC