RFC 1334 (rfc1334) - Page 2 of 16
PPP Authentication Protocols
Alternative Format: Original Text Document
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