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1. PPP USERNAME AND PASSWORD FOR INTERNET ACCESS SOFTWARE
2. PPP USERNAME AND PASSWORD FOR INTERNET ACCESS PASSWORD

The remote client does not authenticate the server. With unidirectional authentication, only the side receiving the call (NAS) authenticates the remote side (client). Unidirectional Vs Bi-directional AuthenticationĪs with most types of authentication, PAP supports bi-directional (two way) and unidirectional (one way) authentication.

PPP USERNAME AND PASSWORD FOR INTERNET ACCESS PASSWORD

Situations where a plaintext password must be available to simulate a login at the remote host Incompatibilities between different vendor implementations of CHAP For more information on CHAP, refer to Understanding and Configuring PPP CHAP Authentication.ĭespite its shortcomings, PAP may be used in the following environments:Ī large installed base of client applications that do not support CHAP Background InformationĬHAP is considered to be more secure because the user password is never sent across the connection. Refer to Cisco Technical Tips Conventions for more information on document conventions.

PPP USERNAME AND PASSWORD FOR INTERNET ACCESS SOFTWARE

This document is not restricted to specific software and hardware versions. There are no specific requirements for this document. For more information on troubleshooting all the PPP phases (LCP, Authentication, NCP), refer to document PPP Troubleshooting Flowchart for a complete flowchart for step-by-step troubleshooting of all related PPP phases and negotiated parameters. The remote node is in control of the frequency and timing of the login attempts.įor more information on troubleshooting PPP authentication (using either PAP or CHAP), refer to Troubleshooting PPP (CHAP or PAP) Authentication for a complete, step-by-step flow chart for troubleshooting the PPP authentication phase. Passwords are sent across the link in clear text and there is no protection from playback or trial-and-error attacks. PAP is not a secure authentication protocol. After the PPP link establishment phase is complete, a username and password pair is repeatedly sent by the remote node across the link (in clear text) until authentication is acknowledged, or until the connection is terminated. PAP provides a simple method for a remote node to establish its identity using a two-way handshake. Both are specified in RFC 1334 and are supported on synchronous and asynchronous interfaces. Point-to-Point Protocol (PPP) currently supports two authentication protocols: Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP).