What is SLIP (Serial Line Internet Protocol)?
The Serial Line Internet Protocol (SLIP) is a mostly obsolete encapsulation of the Internet Protocol designed to work over serial ports and modem connections. It is documented in RFC 1055. On PCs, 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.It is a very simple layer two protocol that provides only basic framing for IP. SLIP is used for communication between two machines that are previously configured for communication with each other. For example, your Internet server provider may provide you with a SLIP connection so that the providers server can respond to your requests, pass them on to the Internet, and forward your requested Internet responses back to you.