ADTRAN 1000R Series

Command Reference Guide PPP Interface Configuration Command Set

Several examp le sce na r ios ar e giv en below fo r c lar ity.

Configuring CHAP Example 1: Only the local router requires the peer to authenticate itself.

On the local router (hostn ame Local):

Local(config-ppp 1)#ppp authentication chap

Local(config-ppp 1)#username Peer password same

On the peer (hostname 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 username 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.

Configuring CHAP Example 2: Using the ppp chap hostname command as an alternate solution.

On the local router (hostn ame Local):

Local(config-ppp 1)#ppp authentication chap

Local(config-ppp 1)#username farend password same

On the peer (hostname Peer):

Peer(config-ppp 1)#ppp chap hostname farend

Peer(config-ppp 1)#ppp chap password same

Notice the local router is expecting username "farend" even though the peer router's hostname is "Peer."

Therefore the peer router can use the ppp chap hostname command to send the correct name in the

challenge.

The PPP username and password database is separate and distinct from the global

username password database. For PAP and CHAP, use the database under the PPP

interface configuration.

Both ends must have identical passwords.