ADTRAN AOS Version R10.1.0 Command Reference Manual page 2571

Command Reference Guide
Several example scenarios are given below for clarity.
Configuring CHAP Example 1: Only the local router requires the peer to authenticate itself.
On the local router (host name Local):
Local(config-ppp 1)#ppp authentication chap
Local(config-ppp 1)#username Peer password same
On the peer (host name Peer):
Peer(config-ppp 1)#ppp chap password same
The first line of this configuration sets the authentication mode to CHAP. This means the peer is required to
authenticate itself to the local router via CHAP. The second line is the user name and password expected
to be sent from the peer. The peer uses its hostname and ppp chap password commands to send the
proper authentication information.
Both ends must have identical passwords.
Configuring CHAP Example 2: Using the ppp chap hostname command as an alternate solution.
On the local router (host name Local):
Local(config-ppp 1)#ppp authentication chap
Local(config-ppp 1)#username farend password same
On the peer (host name Peer):
Peer(config-ppp 1)#ppp chap hostname farend
Peer(config-ppp 1)#ppp chap password same
Notice the local router is expecting user name farend even though the peer router's host name is Peer.
Therefore, the peer router can use the ppp chap hostname command to send the correct name in the
challenge.
Both ends must have identical passwords.
Configuring CHAP Example 3: Both routers require each other to authenticate themselves using
the same shared password.
On the local router (host name Local):
Local(config-ppp 1)#ppp authentication chap
Local(config-ppp 1)#username Peer password same
60000CRG0-35E Copyright © 2012 ADTRAN, Inc.
PPP Interface Command Set
2571