Hello, I set up an OpenVPN server on my VPS. My VPS has 1 Gbps symmetric, I tested it using speedtest-cli. At home I have 150 Mbps down, 15 Mbps up. Tested using Speedtest.net. I'm 100% sure that the speeds are always nearly the same. However, my VPN is really slow. I never get over the 30 Mbps down, sometimes even 15 Mbps. Things I've tried & other info: [list] [*]Use UDP or TCP [*]Use tcp-nodelay [*]Use mssfix 1400 (and lower) [*]Use tun-mtu 1440 (and lower) [*]Use without comp-lzo [*]CPU usage is not going over 10% (both client & server) [*]RAM usage is not over 10% (both client & server) [*]Server is using VirtIO network driver, also tried Intel PRO/1000 (seems to only make it worse) & Realtek 8139 [*]OS: Debian Sid x64 (server) Ubuntu 14.04 LTS (client) [*]OpenVPN 2.3.2 (server & client)[/list] I really don't know what's wrong. Using the same setup at the same VPS provider earlier I could easily reach 150 Mbps down. server.conf [code]port 443 proto tcp topology subnet dev tun ca ca.crt cert server.crt key server.key dh dh2048.pem server 10.8.0.0 255.255.255.0 ifconfig-pool-persist ipp.txt push "redirect-gateway def1 bypass-dhcp" push "dhcp-option DNS 8.8.8.8" push "dhcp-option DNS 8.8.4.4" keepalive 10 120 comp-lzo user nobody group nogroup persist-key persist-tun status openvpn-status.log verb 3[/code] client.conf [code]client dev tun proto tcp remote ip port resolv-retry infinite nobind persist-key persist-tun ca ca.crt cert client.crt key client.key ns-cert-type server comp-lzo verb 3[/code] I would be so happy if somebody knows how to fix it (and is willing to tell me how)! :D If you need more information please tell me. [b]Note:[/b] I managed to get 60 Mbps down using UDP. However this is still not 150 Mbps and I [b]have[/b] to use TCP. I could reach 150 Mbps down earlier using TCP.

OpenVPN is very slow

Naxiz

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Naxiz

Can't edit anymore.

Little update: just tried using a new Debian stable install with a new OpenVPN install at another VPS provider: same results.

Naxiz

I've tried CentOS, Debian stable and Debian Sid at different VPS providers with all the same results.

$ iperf -c 192.168.0.1 -n 50M
------------------------------------------------------------
Client connecting to 192.168.0.1, TCP port 5001
TCP window size: 45.0 KByte (default)
------------------------------------------------------------
[  3] local 192.168.0.2 port 56739 connected with 192.168.0.1 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-27.2 sec  50.0 MBytes  15.4 Mbits/sec

(I changed the internal IP)