In the most common case, MTU on the physical interface is 1500, so it is better to set OpenVPN TUN MTU to a value lower than the real MTU, and MSSFIX to MTU-40, as in the example above. These lines are still presented in the OpenVPN source code, so that is why we are getting the slowdown! Additionally, you can try experimenting with MTU and MSSFIX parameters, if you know what you are doing. To fix it, developers hardcoded these lines, which work for non-Windows based servers and clients: #ifndef WIN32 However, this caused completely strange issues with the MTU for all adapters in Windows. To unify the data transfer channel, developers set the fixed buffers to 64Kb. In the year 2004, OpenVPN had a problem with different buffer sizes on different platforms. You might be wondering why and how these tweaks work? Let's refer to the history of OpenVPN. Push "rcvbuf 393216" The causes of the slowdown If you are running OpenVPN over UDP, you might get a better experience by setting fixed buffer values. Now, a smart screen might appear and ask for a confirmation. Double-click on the downloaded OpenVPN installer file. Save the downloaded file to your computer. The causes of the slowdown OpenVPN over UDP So here we go: Download the OpenVPN installer file from the link above. your client computer is not accessible, put the following additional lines in your nf file: If for some reason this is not possible, e.g. Now, add the same lines to your client configuration file (*.ovpn or *.conf). Windows users who connect to a Linux server will experience faster speeds. This will prevent OpenVPN from tweaking the buffer size between the server and the client. Open your nf file (see the OpenVPN installation directory in Windows and /etc/openvpn in linux) and just add these two lines: sndbuf 0 It can help you significantly improve the bandwith. While the general advice you can find on the Internet is to tweak the MTU (Maximum transmission unit) value and/or MSSFIX parameters, here is another trick you should try. This issue is very common for all OpenVPN users. If you use OpenVPN and experience a slow speed over its channel, you might be getting annoyed. OpenVPN is a well-known VPN client for secure remote access or virtual private networking. With CyberGhost VPN you gain access to censored or geo-restricted content from all around the world.ĬyberGhost is available on all your devices and for all major operating systems, including configurations for routers.RECOMMENDED: Click here to fix Windows issues and optimize system performance
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