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Simultaneous use of multiple OpenVPNs on one server

Posted by Alex On November 25, 2021

You can simultaneously use several OpenVPN processes on the same server, while they will work on different ports and provide separate virtual private networks that do not overlap with each other. Multiple instances of OpenVPN are provided out of the box, but additional configuration is required. 1. OpenVPN services must use different ports All OpenVPN services must use a free...

Comparison of performance (data transfer rate) of OpenVPN over UDP and TCP

Posted by Alex On November 25, 2021

The previous article showed how to use OpenVPN with TCP instead of the default UDP. It is also known that the use of the TCP protocol is not recommended because, due to the “overhead” of the TCP transport protocol, less payload will be transmitted, since part of the channel will be occupied by the transmission of overhead information necessary to...

How to use OpenVPN with TCP protocol

Posted by Alex On November 25, 2021

By default, OpenVPN uses UDP and it is officially recommended to use it. However, TCP also works great with OpenVPN and you can use it if needed. Theoretically, the TCP protocol has more “overhead”, that is, some part of the transmitted data will not carry the payload, but is only necessary for the normal operation of TCP, which monitors the...

How to change configuration files when migrating from OpenVPN 2.4.* to OpenVPN 2.5.*

Posted by Alex On November 25, 2021

As of fall 2021, OpenVPN has moved to the new major branch 2.5.* for almost a year. If you were slow to update, now the new branch can be considered time-tested. However, if you are upgrading from the 2.4 branch, you may need to adjust the configuration files. 1. In the server and client configuration files, replace the line cipher...