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Point-to-Point Protocol: A proposal for multi-protocol transmission of datagrams over Point-to-Point links (RFC1134)

IP.com Disclosure Number: IPCOM000001945D
Original Publication Date: 1989-Nov-01
Included in the Prior Art Database: 2000-Sep-12
Document File: 32 page(s) / 79K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

D. Perkins: AUTHOR

Abstract

The Point-to-Point Protocol (PPP) provides a method for transmitting datagrams over serial point-to-point links. PPP is composed of three parts:

This text was extracted from a ASCII document.
This is the abbreviated version, containing approximately 3% of the total text.

Network Working Group D. Perkins

Request for Comments: 1134 CMU

November 1989

The Point-to-Point Protocol: A Proposal for Multi-Protocol

Transmission of Datagrams Over Point-to-Point Links

Table of Contents

Status of this Memo ................................... 2

Abstract .............................................. 2

1. Introduction ....................................... 2

1.1 Motivation ........................................ 2

1.2 Overview of PPP ................................... 3

1.3 Organization of the document ...................... 4

2. Physical Layer Requirements ........................ 4

3. The Data Link Layer ................................ 4

3.1 Frame Format ...................................... 5

4. The PPP Link Control Protocol (LCP) ................ 8

4.1 The LCP Automaton ................................. 9

4.1.1 Overview ........................................ 9

4.1.2 State Diagram ................................... 10

4.1.3 State Transition Table .......................... 12

4.1.4 Events .......................................... 12

4.1.5 Actions ......................................... 14

4.1.6 States .......................................... 16

4.2 Loop Avoidance .................................... 19

4.3 Packet Format ..................................... 19

4.3.1 Configure-Request ............................... 21

4.3.2 Configure-Ack ................................... 21

4.3.3 Configure-Nak ................................... 22

4.3.4 Configure-Reject ................................ 24

4.3.5 Terminate-Request and Terminate-Ack ............. 25

4.3.6 Code-Reject ..................................... 26

4.3.7 Protocol-Reject ................................. 27

4.3.8 Echo-Request and Echo-Reply ..................... 28

4.3.9 Discard-Request ................................. 29

4.4 Configuration Options ............................. 30

4.4.1 Format .......................................... 31

5. A PPP Network Control Protocol (NCP) for IP ........ 32

5.1 Sending IP Datagrams .............................. 33

APPENDICES ............................................ 33

A. Asynchronous HDLC .................................. 33

B. Fast Frame Check Sequence (FCS) Implementation ..... 35

B.1 FCS Computation Method ............................ 35

B.2 Fast ...