Command:

ppp authentication


Mode:

Router(config-if)#

Syntax:
 

ppp authentication {chap | chap pap | pap chap | pap} [if-needed] [list-name | default] [callin]

no ppp authentication

 

Syntax Description:

chap

Enables CHAP on a serial interface.

pap

Enables PAP on a serial interface.

chap pap

Enables both CHAP and PAP, and performs CHAP authentication before PAP.

pap chap

Enables both CHAP and PAP, and performs PAP authentication before CHAP.

if-needed

(Optional) Used with TACACS and XTACACS. Do not perform CHAP or PAP authentication if the user has already provided authentication. This option is available only on asynchronous interfaces.

list-name

(Optional) Used with AAA/TACACS+. Specifies the name of a list of TACACS+ methods of authentication to use. If no list name is specified, the system uses the default. Lists are created with the aaa authentication ppp command.

default

(Optional) Used with AAA/TACACS+. Created with the aaa authentication ppp command.

callin

(Optional) Specifies authentication on incoming (received) calls only.


Command Description:

The ppp authentication command is used configure the PPP PAP or CHAP authentication protocols on an interface. The interface must be using ppp encapsulation to access these protocols.

Example:
Router(config-if)#ppp authentication pap
 
Misconceptions:
None

Related Commands:
ppp pap
encapsulation ppp
username

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