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SLIP (Serial Line Internet Protocol)

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When one TCP/IP system connects with another TCP/IP system over a serial point-to-point communication line (e.g., a dial-up modem), some way is needed to transport IP packets (a network layer activity) across the serial link (a data link layer activity). Basically, IP packets must be encapsulated into data link layer frames to make the trip across the serial link.

Two schemes have been adopted by the Internet community to provide these links: SLIP and PPP (Point-to-Point Protocol). Both protocols transport IP packets, but PPP has replaced SLIP in nearly all installations. PPP transports other protocols such as DECnet, IPX, and AppleTalk, and supports synchronous transfers, frame error detection, and controls to automatically configure addresses and links. SLIP is described in RFC 1055 (A Nonstandard for Transmission of IP Datagrams Over Serial Lines: Slip, June 1988).

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