RFC 1334 (rfc1334) - Page 2 of 16

PPP Authentication Protocols

RFC 1334                   PPP Authentication               October 1992


   SECURITY CONSIDERATIONS ........................................   14
   REFERENCES .....................................................   15
   ACKNOWLEDGEMENTS ...............................................   16
   CHAIR'S ADDRESS ................................................   16
   AUTHOR'S ADDRESS ...............................................   16

1.  Introduction

   PPP has three main components:

      1. A method for encapsulating datagrams over serial links.

      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.

   In order to establish communications over a point-to-point link, each
   end of the PPP link must first send LCP packets to configure the data
   link during Link Establishment phase.  After the link has been
   established, PPP provides for an optional Authentication phase before
   proceeding to the Network-Layer Protocol phase.

   By default, authentication is not mandatory.  If authentication of
   the link is desired, an implementation MUST specify the
   Authentication-Protocol Configuration Option during Link
   Establishment phase.

   These authentication protocols are intended for use primarily by
   hosts and routers that connect to a PPP network server via switched
   circuits or dial-up lines, but might be applied to dedicated links as
   well.  The server can use the identification of the connecting host
   or router in the selection of options for network layer negotiations.

   This document defines the PPP authentication protocols.  The Link
   Establishment and Authentication phases, and the Authentication-
   Protocol Configuration Option, are defined in The Point-to-Point
   Protocol (PPP) [1].

1.1.  Specification Requirements

   In this document, several words are used to signify the requirements
   of the specification.  These words are often capitalized.

   MUST
      This word, or the adjective "required", means that the definition
      is an absolute requirement of the specification.



Lloyd & Simpson