Before going into the topic, let’s have a quick introduction to the VPN. On a general note, VPN’s are programs which add additional security your internet connection thereby protects your data. The most notable and interesting feature is, using a VPN you can get access to Geo-restricted content. If you are familiar with platforms like Kodi, you might have faced such issues. Refer to this article on the need for VPN on Kodi to know more about it. Let’s stick to this topic now…
What’s an open VPN?
A VPN or a Virtual Private Network is a private network that allows individuals and companies to exchange and access data on a dedicated server from whichever computer or device they desire. These networks are obviously private and put an emphasis on the privacy segment of the whole concept since this data needs to be protected and allowed to be accessed only by users with special privileges (usually the log-in credentials). An open VPN functions in such a way it creates a private tunnel which is used for data channeling over the Internet towards the desired destination, which acts like it is connected to the Internet locally.
Definition of an open VPN
Open VPN uses SSL/TSL protocol (Secure Socket Layer/Transport Layer Security) which establishes a communication channel between specific destinations defined within a single VPN. Similarly to this, you can establish a similar degree of security as if you created it by making use of the IPsec (IP Security) protocol. A significant difference between an open VPN and other types lies in the fact that here you need to adjust properties of every client connected to the network, which is not the case with other types of VPNs. A single application is installed on both the server as well as all the client computers, so this type of a virtual private network can also be considered to be some sort of a peer-to-peer type. All data packets are directed into a single UDP/TCP port by choice (by definition this is the port 1194). All of the traffic which is channeled in such a way is encrypted and sent to the other point of destination in the VPN or decrypted if we are talking about incoming data.
The open VPN application
The open VPN application has been created by using the Open Source GNU license and can be installed on all current operating systems. However, the application is more or less a command line which can be executed as a service within the operating system. You can run this application in a lot of different ways by adjusting the configuration file according to your needs and requirements. It’s possible to use this application for permanent or temporary connection of clients and a server. The adjusting is basically the same in both cases as you are installing the same application on all participants within the network. Basic configuration is easy to do, but the overall complexity rises with the number of clients and different individual requests, when specific knowledge and experience is required.
Virtualization of an open VPN
Virtualization of the network interface in an open VPN is done with two interfaces – tun and tap. Inside Open VPN you can find both of these interfaces working together, which is made possible by implementing a virtual Ethernet network card. The tun interface controls the virtual network card, which means that it can’t send data directly to physical computers, yet it transcodes it to a program which processes the data further and sends it to real clients or the server.