Cisco Router PPP Authentication

R1 (config) #int s1/0

R1 (config-if) #ip address 192.168.1.1 255.255.255.0

R1 (config-if) #clock rate 64000 Set clock frequency

R1 (config-if) #no shutdown

R1 (config-if) #encapsulation PPP-enabled PPP authentication

R1 (config-if) #ppp pap sent-username R2 password Cisco authenticated user and password

R2 (config) #username R2 password Cisco

R2 (config) #int s1/0

R2 (config-if) #ip address 192.168.1.2 255.255.255.0

R2 (config-if) #clock rate 64000

R2 (config-if) #no shutdown

R2 (config-if) #encapsulation PPP

R2 (config-if) #ppp authentication pap open PAP certification service

R3 (config) #username R3 password Cisco

R3 (config) #int s1/0

R3 (config-if) #ip address 192.168.1.1 255.255.255.0

R3 (config-if) #clock rate 64000

R3 (config-if) #no shutdown

R3 (config-if) #encapsulation PPP

R3 (config-if) #ppp authentication pap

R3 (config-if) #ppp pap sent-username R4 password Cisco

R4 (config) #username R4 password Cisco

R4 (config) #int s1/0

R4 (config-if) #ip address 192.168.1.2 255.255.255.0

R4 (config-if) #clock rate 64000

R4 (config-if) #no shutdown

R4 (config-if) #encapsulation PPP

R4 (config-if) #ppp authentication pap

R4 (config-if) #ppp pap sent-username R3 password Cisco

Cisco Router PPP Authentication