Cisco® Secure Internet Security Solutions

Dial-In User Authentication, Authorization, and Accounting (AAA)

This section deals with the authentication of users accessing dial-in services. Authentication can occur at either the user or the device level.

The most commonly used protocols for a dial-in connection are the Point-to-Point Protocol (PPP) and the Serial Line Internet Protocol (SLIP). Both of these protocols require a minimum of a 1200 baud connection.

Although using Password Authentication Protocol (PAP) or Challenge Handshake Authentication Protocol (CHAP) for authentication is a viable option in smaller environments, the administrative overhead involved might become unmanageable in a larger environment. This is because each user should have a separate entry. A single entry can ...