The serial line protocols, SLIP and PPP, provide the Internet connectivity for the poor. Apart from a modem and a serial board equipped with a FIFO buffer, no hardware is needed. Using it is not much more complicated than a mailbox, and an increasing number of private organizations offer dial-up IP at an affordable cost to everyone.
There are both SLIP and PPP drivers available for . SLIP has been there for quite a while, and works fairly reliable. A PPP driver has been developed recently by Michael Callahan and Al Longyear. It will be described in the next chapter.