R1(config)#int s1/0

R1(config-if)#ip address 192.168.1.1 255.255.255.0

R1(config-if)#clock rate 64000 設置時鐘頻率

R1(config-if)#no shutdown

R1(config-if)#encapsulation ppp 開啟ppp認證

R1(config-if)#ppp pap sent-username R2 password cisco 認證用戶及密碼

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 開啟pap認證服務

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路由器ppp認證