This method is particularly suitable for the model A as it lacks an ethernet port, but it will work with any Raspberry model. Optionally a monitor / keyboard / ethernet / wifi that you can plug to your Raspberry. A linux computer that will act as a second serial link endpoint and a network gateway.USB UART convertor + cable with 3.3v logic levels.The operating principle is very simple, but it may be tricky to setup things properly, especially if your communication is limited to UART only. Please note that the UART is designed to work in kilobits speed range (115.2kbit by default), that's sufficient for ssh and small files transfers, but it will take ages to transfer large files. The UART serial port is not directly suitable for TCP/IP traffic so we are going to use a PPP protocol that will encapsulate the serial link and give us an IP interface. This can be very helpful if there is no other means of connection available like ethernet or wifi dongle. In this tutorial I will show you how to connect your Raspberry Pi to the Internet just by using its serial line which is accessible on GPIO.
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