Point To Point Protocol

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P
-
-P
P
OINT
TO
OINT
ROTOCOL
packetlife.net
PPP Components
PPP Summary
Standard RFC 1661
Link Control Protocol (LCP)
Provides for the establishment, configuration, and maintenance of a
Asynchronous serial, synchronous
PPP link. Protocol-independent options are negotiated by LCP.
Interfaces
serial, ISDN, HSSI
Network Control Protocol (NCP)
A separate NCP is used to negotiate the configuration of each
PPP Features
network layer protocol (such as IP) carried by PPP.
Protocol Multiplexing · Multiple NCPs
PPP Header
Optional Authentication · PAP/CHAP
8
16
24
32
Optional Compression · Stacker/predictor
Address
Control
Protocol
Loopback Detection · Provided by LCP
Load Balancing · Multilink PPP
LCP Header
8
16
24
32
Connection Phase Flowchart
Code
Identifier
Length
Auth Required
Dead
Establish
Authentication Protocols
No Auth
Plaintext Authentication Protocol (PAP)
Original, obsolete authentication protocol which relies on the
Terminate
Authenticate
Failure
exchange of a plaintext key to authenticate peers (RFC 1334).
Success
Admin
Challenge Handshake Authentication Protocol (CHAP)
Shutdown
Network
Authenticates peers using the MD5 checksum of a pre-shared secret
key (RFC 1994).
PPP Connection Example
Extensible Authentication Protocol (EAP)
Provides MD5-based authentication similar to CHAP (RFC 3748).
Could be expanded to support other EAP mechanisms as well.
General PPP Configuration
LCP Configuration Request
LCP Configuration Ack
peer-hostname
password
CHAP Challenge
CHAP Response
name first-IP last-IP
CHAP Success
IP Control Configuration Request
IP Control Configuration Ack
CDP Control Configuration Request
CDP Control Configuration Ack
PPP Compression Algorithms
name
IP-address
Stacker
Replaces repetitive data with symbols from a
dynamic dictionary (more processor-intensive)
Multilink PPP Configuration
Predictor
Attempts to predict sequential data (more
memory-intensive)
IP-address subnet-mask
Troubleshooting
group
group
by Jeremy Stretch
v1.2

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