Serial Line Internet Protocol (SLIP)
SLIP was an early attempt at directly integrating modem protocols with TCP/IP. SLIP began with 3COM's UNET TCP/IP. It was later implemented on Berkeley Unix systems, and since then has become widely available, both within the Unix world and in the world of PC compatibles.
SLIP's technology is now considered somewhat obsolete. There is no question, however, that it works, and in some situations SLIP's simplicity is a benefit.
What SLIP Does
The purpose of SLIP is to transmit IP datagrams across a modem line. SLIP provides no physical addressing or error control and depends on upper-layer protocols for error control functions. SLIP simply sends the data and then sends a signal marking the end of the data.
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