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Table Of Contents  The TCP/IP Guide
 9  TCP/IP Lower-Layer (Interface, Internet and Transport) Protocols (OSI Layers 2, 3 and 4)
      9  TCP/IP Network Interface Layer (OSI Data Link Layer) Protocols
           9  TCP/IP Serial Line Internet Protocol (SLIP) and Point-to-Point Protocol (PPP)
                9  Point-to-Point Protocol (PPP)
                     9  PPP Fundamentals and Operation

Previous Topic/Section
PPP Link Setup and Phases
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PPP Core Protocols: Link Control, Network Control and Authentication
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PPP Standards
(Page 2 of 3)

Base PPP Standards

Table 25 shows the “main” documents that describe PPP in general terms. They cover the basic operation of PPP including the PPP Link Control Protocol (LCP) and encapsulation of datagrams.

Table 25: PPP Base Standards

RFC Number

Standard Name



PPP LCP Extensions

Defines two new features for LCP that allow devices to identify each other to the other device and also tell the other device how much time remains in the current session.


The Point-to-Point Protocol (PPP)

Base standard for the Point-to-Point protocol. Describes PPP architecture, general operation (including the process of link establishment, maintenance and termination) and details of the LCP protocol.


PPP in HDLC-like Framing

Defines the specific framing method for PPP frames, based on that used in HDLC. This standard can be considered a “companion” to the main PPP standard, RFC 1661.

LCP Support Protocols

These protocols, shown in Table 26, support the basic operation of LCP. At this time the only protocols I put in this group are those that provide authentication services during link startup.

Table 26: PPP LCP Support Protocol Standards

RFC Number

Standard Name



PPP Authentication Protocols

Defines the two PPP authentication protocols: Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP).

Note that RFC 1994 obsoletes RFC 1334, but does not discuss the PAP protocol. This basically tells you what the IETF thinks about PAP.
J See the topic on PAP and CHAP for more on this.


PPP Challenge Handshake Authentication Protocol (CHAP)

Updates the information about CHAP provided in RFC 1334.

Network Control Protocols (NCPs)

These are protocols that negotiate parameters specific to various layer three protocols carried over PPP. They are described in Table 27.

Table 27: PPP Network Control Protocol Standards

RFC Number

Standard Name



The PPP Internet Protocol Control Protocol (IPCP)

The NCP for the Internet Protocol (IP).


The PPP OSI Network Layer Control Protocol (OSINLCP)

The NCP for OSI protocol suite network layer protocols, such as CNLP, ES-IS, and IS-IS.


The PPP AppleTalk Control Protocol (ATCP)

The NCP for the AppleTalk protocol.


The PPP Internetworking Packet Exchange Control Protocol (IPXCP)

The NCP for the Novell Internetworking Packet Exchange (IPX) protocol.


The PPP SNA Control Protocol (SNACP)

The NCP for IBM's Systems Network Architecture (SNA).


The PPP NetBIOS Frames Control Protocol (NBFCP)

The NCP for NetBIOS Frames (NBF, also commonly called NetBEUI).


IP Version 6 over PPP

Describes the NCP for IPv6: the IPv6 Control Protocol (IPv6CP).

Previous Topic/Section
PPP Link Setup and Phases
Previous Page
Pages in Current Topic/Section
Next Page
PPP Core Protocols: Link Control, Network Control and Authentication
Next Topic/Section

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Version 3.0 - Version Date: September 20, 2005

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