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Today we are going to convert our raspberry pi into an effective router to create a new local subnet where we can safely configure our servers.
In my tutorial, the device we are going to use is a Raspberry Pi 3b model, but any device with *nix, an ethernet adapter and 1 free usb slot (either 2.0, 3.0, usb c, micro usb) with usb-to-ethernet support compiled, should work.