Point-to-Point Protocol (PPP) initial configuration options
RFC 1172

Document Type RFC - Proposed Standard (July 1990; No errata)
Obsoleted by RFC 1332, RFC 1331
Last updated 2013-03-02
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Network Working Group                                         D. Perkins
Request for Comments: 1172                                           CMU
                                                                R. Hobby
                                                                UC Davis
                                                               July 1990

    The Point-to-Point Protocol (PPP) Initial Configuration Options

Status of this Memo

   This RFC specifies an IAB standards track protocol for the Internet
   community.

   Please refer to the current edition of the "IAB Official Protocol
   Standards" for the standardization state and status of this protocol.

   This proposal is the product of the Point-to-Point Protocol Working
   Group of the Internet Engineering Task Force (IETF).  Comments on
   this memo should be submitted to the IETF Point-to-Point Protocol
   Working Group chair.

   Distribution of this memo is unlimited.

Abstract

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

      1) a method for encapsulating datagrams over serial links,
      2) an extensible Link Control Protocol (LCP), and
      3) a family of Network Control Protocols (NCP) for establishing
      and configuring different network-layer protocols.

   The PPP encapsulating scheme, the basic LCP, and an NCP for
   controlling and establishing the Internet Protocol (IP) (called the
   IP Control Protocol, IPCP) are defined in The Point-to-Point Protocol
   (PPP) [1].

   This document defines the intial options used by the LCP and IPCP. It
   also defines a method of Link Quality Monitoring and a simple
   authentication scheme.

Perkins & Hobby                                                 [Page i]


RFC 1172                  PPP Initial Options                  July 1990

                           Table of Contents

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

     2.     Link Control Protocol (LCP) Configuration Options .....    1
        2.1       Maximum-Receive-Unit ............................    2
        2.2       Async-Control-Character-Map .....................    3
        2.3       Authentication-Type .............................    5
        2.4       Magic-Number ....................................    7
        2.5       Link-Quality-Monitoring .........................   10
        2.6       Protocol-Field-Compression ......................   11
        2.7       Address-and-Control-Field-Compression ...........   13

     3.     Link Quality Monitoring ...............................   15
        3.1       Design Motivation ...............................   15
        3.2       Design Overview .................................   15
        3.3       Processes .......................................   16
        3.4       Counters ........................................   18
        3.5       Measurements, Calculations, State Variables .....   19
        3.6       Link-Quality-Report Packet Format ...............   21
        3.7       Policy Suggestions ..............................   25
        3.8       Example .........................................   25

     4.     Password Authentication Protocol ......................   27
        4.1       Packet Format ...................................   27
        4.2       Authenticate ....................................   29
        4.3       Authenticate-Ack ................................   31
        4.4       Authenticate-Nak ................................   32

     5.     IP Control Protocol (IPCP) Configuration Options ......   33
        5.1       IP-Addresses ....................................   34
        5.2       Compression-Type ................................   36

     REFERENCES ...................................................   37

     SECURITY CONSIDERATIONS ......................................   37

     AUTHOR'S ADDRESS .............................................   37

Perkins & Hobby                                                [Page ii]


RFC 1172                  PPP Initial Options                  July 1990

1.  Introduction

   The Point-to-Point Protocol (PPP) [1] proposes a standard method of
   encapsulating IP datagrams, and other Network Layer protocol
   information, over point-to-point links.  PPP also proposes an
   extensible Option Negotiation Protocol.  [1] specifies only the
   protocol itself; the initial set of Configuration Options are
   described in this document.  These Configuration Options allow MTUs
   to be changed, IP addresses to be dynamically assigned, header
   compression to be enabled, and much more.

   This memo is divided into several sections.  Section 2 describes
   Configuration Options for the Link Control Protocol. Section 3
   specifies the use of the Link Quality Monitoring option. Section 4
   defines a simple Password Authentication Protocol. Finally, Section 5
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