The Serial line IP reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Serial line IP

The Serial Line Internet Protocol (SLIP) is a mostly obsolete encapsulation of the IP protocol designed to work over serial ports and modem connections. SLIP has been largely replaced by the Point-to-Point protocol (PPP), which is better engineered, has more features and does not require its IP address configuration to be set before it is established.

SLIP modifies a standard Internet datagram by appending a special "SLIP END" character to it, which allows datagrams to be distinguished as separate. SLIP requires a port configuration of 8 data bits, no parity, and EIA or hardware flow control. SLIP does not provide error detection, being reliant on other high-layer protocols for this. Over a particularly error-prone dial-up connection therefore, SLIP on its own is not satisfactory.

A version of SLIP with header compression was called CSLIP (Compressed SLIP).

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