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RFC1661


Network Working Group W. Simpson, Editor

Request for Comments: 1661 Daydreamer

STD: 51 July 1994

Obsoletes: 1548

Category: Standards Track

The Point-to-Point Protocol (PPP)

Status of this Memo

This document specifies an Internet standards track protocol for the

Internet community, and requests discussion and suggestions for

improvements. Please refer to the current edition of the "Internet

Official Protocol Standards" (STD 1) for the standardization state

and status of this protocol. Distribution of this memo is unlimited.

Abstract

The Point-to-Point Protocol (PPP) provides a standard method for

transporting multi-protocol datagrams over point-to-point links. PPP

is comprised of three main components:

1. A method for encapsulating multi-protocol datagrams.

2. A Link Control Protocol (LCP) for establishing, configuring,

and testing the data-link connection.

3. A family of Network Control Protocols (NCPs) for establishing

and configuring different network-layer protocols.

This document defines the PPP organization and methodology, and the

PPP encapsulation, together with an extensible option negotiation

mechanism which is able to negotiate a rich assortment of

configuration parameters and provides additional management

functions. The PPP Link Control Protocol (LCP) is described in terms

of this mechanism.

Table of Contents

1. Introduction .......................................... 1

1.1 Specification of Requirements ................... 2

1.2 Terminology ..................................... 3

2. PPP Encapsulation ..................................... 4

Simpson [Page i]

RFC 1661 Point-to-Point Protocol July 1994

3. PPP Link Operation .................................... 6

3.1 Overview ........................................ 6

3.2 Phase Diagram ................................... 6

3.3 Link Dead (physical-layer not ready) ............ 7

3.4 Link Establishment Phase ........................ 7

3.5 Authentication Phase ............................ 8




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