Slow OpenVPN on Lenovo laptop

S

skubany

Weaksauce
Joined
Feb 4, 2008
Messages
87
Hi,

I'm running into a peculiar issue while on VPN connection using OpenVPN on a Lenovo laptop.

Lenovo laptop is T560.
Using OpenVPN config file provided by my VPN provider.
Tested on Ubuntu and Windows 7 using laptop Wifi, laptop LAN and dongle LAN.
Tested the same OpenVPN config on different laptops (non-Lenovo) and PCs.
I kept the config the same between tests, the only thing that changed was OS (Ubuntu vs Windows) and hardware (built in LAN/WiFi vs Dongle LAN [over USB 3.0]).

I'm using speedtest.net to run the tests.

Results:
Lenovo Windows 7 LAN - slow
Lenovo Windows 7 WiFi - slow
Lenovo Ubuntu LAN - slow
Lenovo Ubuntu WiFi - slow
Lenovo Windows 7 Dongle LAN - slow
Lenovo Ubuntu Dongle LAN - NORMAL

I also have another Lenovo laptop, T460 (or 480) running Win7 which also runs slow over OpenVPN. The T460 I tested long time ago but remember it behaved similarly to T560.

When I connect to my provider VPN over PPTP (Windows VPN connectivity) the speed is NORMAL, so it is only OpenVPN that is running slow as shown above.

What works. A non-lenovo Ubuntu laptop (older than my T560) over Dongle LAN (same dongle used in T560 testing) and internal WiFi. A PC over LAN running Ubuntu and a mini-PC over LAN running Ubuntu.

Any ideas?

Thanks.
 
skubany said:
Hi,

I'm running into a peculiar issue while on VPN connection using OpenVPN on a Lenovo laptop.

Lenovo laptop is T560.
Using OpenVPN config file provided by my VPN provider.
Tested on Ubuntu and Windows 7 using laptop Wifi, laptop LAN and dongle LAN.
Tested the same OpenVPN config on different laptops (non-Lenovo) and PCs.
I kept the config the same between tests, the only thing that changed was OS (Ubuntu vs Windows) and hardware (built in LAN/WiFi vs Dongle LAN [over USB 3.0]).

I'm using speedtest.net to run the tests.

Results:
Lenovo Windows 7 LAN - slow
Lenovo Windows 7 WiFi - slow
Lenovo Ubuntu LAN - slow
Lenovo Ubuntu WiFi - slow
Lenovo Windows 7 Dongle LAN - slow
Lenovo Ubuntu Dongle LAN - NORMAL

I also have another Lenovo laptop, T460 (or 480) running Win7 which also runs slow over OpenVPN. The T460 I tested long time ago but remember it behaved similarly to T560.

When I connect to my provider VPN over PPTP (Windows VPN connectivity) the speed is NORMAL, so it is only OpenVPN that is running slow as shown above.

What works. A non-lenovo Ubuntu laptop (older than my T560) over Dongle LAN (same dongle used in T560 testing) and internal WiFi. A PC over LAN running Ubuntu and a mini-PC over LAN running Ubuntu.

Any ideas?

Thanks.
Click to expand...
Quantify "slow" and "normal"
 
Found a fix.

Adding line shown below to OpenVPN config fixes the issue. I don't know if the buffer value is very high or if tweaking the value can improve things further but the connection speed is satisfactory following addition of this line.

rcvbuf 393216
 
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