R3721-F3210-F3171-HP High-End Firewalls Network Management Configuration Guide-6PW101

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Configuring PPP
NOTE:
• The PPP configuration is available only at the command line interface (CLI).
• The firewall module does not support dialer interfaces.
Overview
Point-to-Point Protocol (PPP) is a link layer protocol that carries network layer packets over point-to-point
links. It gains popularity because it provides user authentication, supports synchronous/asynchronous
communication, and allows for easy extension.
PPP contains a set of protocols, including the Link Control Protocol (LCP), various network control
protocols (NCPs), and authentication protocols such as Password Authentication Protocol (PAP),
Challenge Handshake Authentication Protocol (CHAP), Microsoft CHAP (MS-CHAP), and Microsoft
CHAP Version 2 (MS-CHAP-V2). Among these protocols,
• LCP establishes, tears down, and monitors data links.
• NCPs negotiate the formats and types of data packets transmitted on data links.
• PAP, CHAP, MS-CHAP, and MS-CHAP-V2 secure the network.
PAP authentication
PAP is a two-way handshake authentication protocol using plain text passwords. It operates in the
following workflow:
1. The authenticatee sends its username and password to the authenticator.
2. The authenticator then checks the local user list to see if the username and password are correct
and returns an Acknowledge or Not Acknowledge packet.
Figure 59 PAP authentication