PAP and CHAP Configuration and Verification

PAP and CHAP are two authentication protocols used by PPP to provide security to the link. Here are the steps to configure and verify PAP and CHAP:

Configuring PAP:

Step 1: Configure the hostname and enable the interface:

Router(config)# hostname Router1

Router(config)# interface serial 0/0/0

Router(config-if)# ip address 10.0.0.1 255.255.255.0

Router(config-if)# encapsulation ppp

Step 2: Configure the username and password:

Router(config)# username R2 password test

Step 3: Configure PAP on the router:

Router(config)# interface serial 0/0/0

Router(config-if)# ppp authentication pap

Verifying PAP:

Use the debug command to verify PAP authentication:

Router# debug ppp authentication

Router# show debug

Router# show ppp authentication

Configuring CHAP:

Step 1: Configure the hostname and enable the interface:

Router(config)# hostname Router1

Router(config)# interface serial 0/0/0

Router(config-if)# ip address 10.0.0.1 255.255.255.0

Router(config-if)# encapsulation ppp

Step 2: Configure the hostname and password on the remote router:

Router(config)# hostname Router2

Router(config)# username R1 password test

Step 3: Configure CHAP on the local router:

Router(config)# interface serial 0/0/0

Router(config-if)# ppp authentication chap

Verifying CHAP:

Use the debug command to verify CHAP authentication:

Router# debug ppp authentication

Router# show debug Router# show ppp authentication