I installed an openVPN server on my dedicated server on ubuntu server 12.04. Both my server and my current connection are on optic fiber.
I tested server bandwidth: upload 50mbit / download 88mbit
my home bandwith : upload 60mbit / download 96 mbit
But, when I connect to my vpn my average download speed on the same file is 8mbit
The server is brand new, it contains nothing except openvpn, fail2ban, and sometimes a minecraft server. I obviously tested openVPN when disabling everything. When I download from my computer using VPN, the server CPU is only at 27% and memory is fine too so it's not a performance problem..
I followed this tutorial (which is in french but every methods are visible) : http://my1.fr/blog/creer-son-serveur-vpn-sous-debian/
Any idea ?