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PPP Protocol Overview

The Point-to-Point Protocol (PPP), documented in RFC 1661, is currently (early 1996) the best solution for dial-up Internet connections, including ISDN.

PPP is a layered protocol, starting with a Link Control Protocol (LCP) for link establishment, configuration and testing. Once the LCP is initialized, one or many of several Network Control Protocols (NCPs) can be used to transport traffic for a particular protocol suite. The IP Control Protocol (IPCP), documented in RFC 1332, permits the transport of IP packets over a PPP link. Other NCPs exist for Appletalk (RFC 1378), OSI (RFC 1377), DECnet Phase IV (RFC 1762), Vines (RFC 1763), XNS (RFC 1764) and transparent Ethernet bridging (RFC 1638).

Here are some key PPP features, all of which are lacking in SLIP:

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