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When using PPP authentication, the following conditions must be met for authentication to succeed:
Both routers must accept the same authentication method (CHAP or PAP).
Each router must have a username statement that identifies the other router. For example, on RouterA, configure a user name of RouterB.
The password used in both username statements must be identical.
Use the following commands on RouterA:
Press Enter
RouterA>enable
RouterA#config t
RouterA(config)#interface s0/0/0
RouterA(config-if)#encapsulation ppp
RouterA(config-if)#ppp authentication chap
RouterA(config-if)#exit
RouterA(config)#username RouterB password cisco
(Press Ctrl + Z)
RouterA#copy run start
Press Enter
Press Enter again to save changes
Use the following commands on RouterB:
Press Enter
RouterB>enable
RouterB#config t
RouterB(config)#interface s0/0/1
RouterB(config-if)#encapsulation ppp
RouterB(config-if)#ppp authentication chap
RouterB(config-if)#exit
RouterB(config)#username RouterA password cisco
(Press Ctrl + Z)

RouterB#copy run start
Press Enter
Press Enter again to save changes

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