The procedure outlined in the table describes how to
configure PPP encapsulation and PAP/CHAP authentication protocols.
Correct configuration is essential, since PAP and CHAP will use these
parameters to authenticate.
Figure
is an
example of a two-way PAP authentication configuration. Both routers
authenticate and are authenticated, so the PAP authentication commands
mirror each other. The PAP username and password that each router sends
must match those specified with the
username name password password
command of the other router.
PAP provides a simple method for a remote node to establish its identity
using a two-way handshake. This is done only upon initial link
establishment. The hostname on one router must match the username the
other router has configured. The passwords must also match.
CHAP is used to periodically verify the identity of the remote node
using a 3-way handshake. The hostname on one router must match the
username the other router has configured. The passwords must also match.
This is done upon initial link establishment and can be repeated any
time after the link has been established.
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Lab Activity
Lab Exercise: Configuring PPP Authentication
In this lab, the
student will configure a serial interface on the Madrid and
Tokyo routers.
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Lab Activity
e-Lab Activity: Configuring PPP Authentication
In this lab, the student will configure a serial
interface on the Madrid and Tokyo routers.
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Lab Activity
e-Lab Activity:
username name password password
In this activity, the student will demonstrate how to use the
username name password password
command.
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Web Links