RFC 1334 (rfc1334) - Page 1 of 16

PPP Authentication Protocols

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Network Working Group                                           B. Lloyd
Request for Comments: 1334                                           L&A
                                                              W. Simpson
                                                              Daydreamer
                                                            October 1992


                      PPP Authentication Protocols

Status of this Memo

   This RFC specifies an IAB standards track protocol for the Internet
   community, and requests discussion and suggestions for improvements.
   Please refer to the current edition of the "IAB Official Protocol
   Standards" for the standardization state and status of this protocol.
   Distribution of this memo is unlimited.

Abstract

   The Point-to-Point Protocol (PPP) [1] provides a standard method of
   encapsulating Network Layer protocol information over point-to-point
   links.  PPP also defines an extensible Link Control Protocol, which
   allows negotiation of an Authentication Protocol for authenticating
   its peer before allowing Network Layer protocols to transmit over the
   link.

   This document defines two protocols for Authentication: the Password
   Authentication Protocol and the Challenge-Handshake Authentication
   Protocol.  This memo 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 
   mailing list.

Table of Contents

   1.  Introduction ...............................................    2
   1.1 Specification Requirements .................................    2
   1.2 Terminology ................................................    3
   2. Password Authentication Protocol ............................    3
   2.1 Configuration Option Format ................................    4
   2.2 Packet Format ..............................................    5
   2.2.1 Authenticate-Request .....................................    5
   2.2.2 Authenticate-Ack and Authenticate-Nak ....................    7
   3. Challenge-Handshake Authentication Protocol..................    8
   3.1 Configuration Option Format ................................    9
   3.2 Packet Format ..............................................   10
   3.2.1 Challenge and Response ...................................   11
   3.2.2 Success and Failure ......................................   13



Lloyd & Simpson
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