The goal of my thesis was to create a working Raspberry Pi VPN router. In my thesis I created Raspberry Pi VPN router that used two Ethernet ports (USB-Ethernet adapter and Raspberry Pi’s own Ethernet port) and wireless network. The goal was to develop an easy-to-use and inexpensive solution for private use. All network traffic passed through the Raspberry Pi. VPN provided more protection and privacy for the entire network, and not just for one device.

The used operating system was OpenWrt, as the VPN protocol was OpenVPN and the VPN service provider was NordVPN. Based on the test results, the Raspberry Pi model 3B+ slowed down the speed of the Internet connection without a VPN connection and with it more than the ASUS RT-N18U router. Tests showed that the UDP protocol is significantly faster than the TCP protocol. For this reason, when using the OpenVPN protocol, VPN service providers generally recommend using the UDP protocol.

Internet connection speeds were tested three times, after which the average Internet speeds were calculated. From the point of view of the reliability of the study, it was good to test the speeds of Internet connections several times. The reliability of the study would have been increased by testing the speeds of Internet connections on several different days. The results might not have changed significantly, but the load on the VPN servers can affect connection speeds occasionally.

In further research, it is worth comparing the new Raspberry Pi 4 model B’s with the Raspberry Pi model 3B+ used in this thesis. The new Raspberry Pi model 4 B’s have faster processors and more RAM depending on the model. A comparison between different Raspberry Pi 4 model B’s in VPN use would be an interesting and informative project.