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authentication (Static and Dynamic PPP)


Hierarchy Level


Specify the order in which the router tries to negotiate PPP authentication protocols when verifying that a PPP client can access the network. By default, the router tries to negotiate Challenge Handshake Authentication Protocol (CHAP) authentication first, and then tries Password Authentication Protocol (PAP) authentication if the attempt to negotiate CHAP authentication is unsuccessful.

You can specify one or both authentication protocols. If you specify both CHAP and PAP in either order, you must enclose the set of protocol names within square brackets ([ ]).



One or both of the following PPP authentication protocols:

  • chap—Challenge Handshake Authentication Protocol

  • pap—Password Authentication Protocol

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 12.2.