?– (Optional) Enable PPP authentication by performing these steps:
Step 1 Con?¬?gure the router host name to identify itself.
Step 2 Con?¬?gure the username and password to authenticate the PPP peer.
Step 3 Choose the authentication technique to use on the PPP link: PAP or
CHAP.
To enable PPP encapsulation, use the encapsulation ppp command in interface
con?¬?guration mode.
To con?¬?gure PPP authentication, the interface must be con?¬?gured for PPP encapsulation.
Follow these steps to enable PAP or CHAP authentication.
Step 1 Verify that each router has a host name assigned to it. To assign a host name, enter
the hostname name command in global con?¬?guration mode. This name must
match the username that is expected by the authenticating router at the other end
of the link.
Username: santacruz
Host Name: SantaCruz
Password: boardwalk
Central-Site Router
(HQ)
Username: HQ
Host Name: santacruz
Password: boardwalk
Remote Router
(Santa Cruz)
CHAP
Three-Way Handshake
Challenge
Response
Accept or Reject
Establishing a Point-to-Point WAN Connection with PPP 321
Step 2 On each router, de?¬?ne the username and password to expect from the
remote router with the username name password password global
con?¬?guration command.
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