Serial Line Internet Protocol - SLIP protocol

The need for a data link layer protocol to let IP operate over serial links was identified very early on in the development of TCP/IP. To solve the problem they created a very simple protocol that would frame IP data grams for transmission across the serial line. This protocol is called the Serial Line Internet Protocol, or SLIP for short.
SLIP modifies a standard TCP/IP data gram by appending a special "SLIP END" character to it, which distinguishes data gram boundaries in the byte stream. SLIP requires a serial port configuration of 8 data bits, no parity, and either EIA hardware flow control, or CLOCAL mode (3-wire null-modem) UART operation settings.

- Serial Line Interface Protocol (SLIP) is a TCP/IP protocol used for
communication between two machines that are previously configured for communication with each other.
- The dial-up connection to the server is typically on a slower serial line rather than on the parallel or multiplex lines.
- SLIP does not provide error detection, being reliant on other high-layer protocols for this.
- A SLIP connection needs to have its IP address configuration set each time before it is established.
- The Serial Line Internet Protocol (SLIP) is a mostly obsolete encapsulation of the Internet Protocol designed to work over serial ports and modem connections.
- A version of SLIP with header compression is called CSLIP (Compressed SLIP).
- The Parallel Line Internet Protocol (PLIP) is very similar to SLIP, but works at higher speeds via a parallel port.
- SLIP is a STREAMS-based computer networking facility that provides for the transmission and reception of IP packets over serial lines.
- SLIP can be used to connect one host to another via a single, physical serial line connection between serial ports or over longer distances using a modem at each end of a telephone line.