Very slow transfer speeds

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kolargol
OpenVpn Newbie
Posts: 3
Joined: Wed Feb 08, 2017 11:02 am

Re: Very slow transfer speeds

Post by kolargol » Thu Aug 31, 2017 10:00 am

was this issue ever resolved. I have same issues with OpenVPN 2.4.1

dancos
OpenVPN User
Posts: 11
Joined: Thu Nov 03, 2016 9:28 pm

Re: Very slow transfer speeds

Post by dancos » Thu Sep 07, 2017 6:19 am

No, we haven't been able to solve this and had to abandon OpenVPN unfortunately. We've tried every transfer speed improvement suggestion out there and experimented with a myriad of different configurations but never came close to the line speeds.

300000
OpenVPN User
Posts: 23
Joined: Tue May 01, 2012 9:30 pm

Re: Very slow transfer speeds

Post by 300000 » Thu Sep 07, 2017 11:25 am

you can try adding this on your server config to see if the speed can max or not
sndbuf 3399999
rcvbuf 3399999
push "sndbuf 3399999 "
push "rcvbuf 3399999 "


my server run over 6 months without restart and client can connect at full speed up and down and i am happy , hope it can help your speed trouble.

ejanszen
OpenVpn Newbie
Posts: 1
Joined: Thu Feb 01, 2018 1:47 pm

Re: Very slow transfer speeds

Post by ejanszen » Thu Feb 01, 2018 1:56 pm

The answer is easy: You cannot connect with a higher speed than your lowest upload speed.

For instance, if you have like me on the server side a download speed of 75Mb and an upload speed of 8Mb and on the client side a download speed of 30Mb with an upload speed of 4Mb. It is only then logical that the max speed of the VPN connect is 4Mb.

In this example the speed of the VPN connection can only be increased by increasing the upload speed on the client side.

kosta88
OpenVpn Newbie
Posts: 3
Joined: Fri Dec 08, 2017 1:25 pm

Re: Very slow transfer speeds

Post by kosta88 » Fri May 04, 2018 9:06 am

I have the same miserable problem. My upload at home is 12mBit, download at work is at least 50mBit, and yet, I get speeds way below 1mBit.

However, the problem seems to exist when I transfer more smaller files. If I attempt to transfer single bigger file back and forth, seems to work quite well.

We use Sophos Firewall, I will question there, but I see I am not the only one with the problem... any ideas what/how to troubleshoot?

sinister
OpenVPN User
Posts: 11
Joined: Thu May 10, 2018 9:26 pm

Re: Very slow transfer speeds

Post by sinister » Thu May 24, 2018 9:54 pm

ejanszen wrote:
Thu Feb 01, 2018 1:56 pm
The answer is easy: You cannot connect with a higher speed than your lowest upload speed.

For instance, if you have like me on the server side a download speed of 75Mb and an upload speed of 8Mb and on the client side a download speed of 30Mb with an upload speed of 4Mb. It is only then logical that the max speed of the VPN connect is 4Mb.

In this example the speed of the VPN connection can only be increased by increasing the upload speed on the client side.
So what if like in my case you have identical networks 200 down 10 up on both sides but when transferring a file you max out at 1MB ?

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