Ppp Overview; Configuring Ppp And Mp - 3Com 3032 Configuration Manual

12

PPP Overview

C
ONFIGURING
This chapter contains information on the following topics:
PPP Overview
MP Overview
Configure PPP
Configure MP
Display and Debug PPP
Typical PPP Configuration Example
Typical MP Configuration Example
Fault Diagnosis and Troubleshooting of PPP
The Point-to-Point Protocol (PPP) provides a standard method for transporting
multi-protocol datagram over point-to-point links. It gains wide applications since
it can provide user authentication, support synchronous/asynchronous lines and
can be expanded easily.
PPP defines a whole set of protocols, including link control protocol (LCP), network
control protocol (NCP) and authentication protocols (PAP and CHAP). Of them:
Link Control Protocol is used to negotiate some parameters of the link and is
responsible for creating and maintaining the link.
Network Control Protocol is used to negotiate the parameters of network layer
protocol.
PPP Authentication Mode
1 PAP authentication
PAP (Password Authentication Protocol) is a 2-way handshake authentication
protocol and it transmits username and password in plain text over the Internet.
The process of PAP authentication is as follows:
The requester repeatedly sends its username/password combination across the link
until the authenticator responds with an acknowledgment or until the link is
broken. The authenticator may disconnect the link if it determines that the
username/password combination is not valid.
2 CHAP authentication
CHAP (Challenge-Handshake Authentication Protocol) is a 3-way handshake
authentication protocol. It only sends the username but not the password across
the link. The process of CHAP is as follows:
PPP MP
AND