Datasheet

Lab – Troubleshooting Basic PPP with Authentication

*Jun #18 12:01:23.947: Se0/0/0 PPP: Received SENDAUTH Response PASS

*Jun 18 12:01:23.947: Se0/0/0 CHAP: Using hostname from configured hostname

*Jun 18 12:01:23.947: Se0/0/0 CHAP: Using password from AAA

*Jun 18 12:01:23.947: Se0/0/0 CHAP: O RESPONSE id 1 len 23 from "R1"

*Jun 18 12:01:23.947: Se0/0/0 CHAP: I RESPONSE id 1 len 23 from "R2"

*Jun 18 12:01:23.951: Se0/0/0 PPP: Sent CHAP LOGIN Request

*Jun 18 12:01:23.951: Se0/0/0 PPP: Received LOGIN Response PASS

*Jun 18 12:01:23.951: Se0/0/0 CHAP: O SUCCESS id 1 len 4

*Jun 18 12:01:23.951: Se0/0/0 CHAP: I SUCCESS id 1 len 4

____________________________________________________________________________________

The debug output shows a successful CHAP negotiation process. PPP has been established on the link

connecting R1 S0/0/0 and R2 S0/0/0.

d. Use the show run interface s0/0/1 command to examine the settings on S0/0/1.

R1# show run interface s0/0/1

Building configuration...

Current configuration : 123 bytes

interface Serial0/0/1

ip address 192.168.31.1 255.255.255.252

encapsulation ppp

shutdown

ppp authentication pap

end

Resolve all problems found for S0/0/1. Record the commands used to correct the configuration.

____________________________________________________________________________________

R1(config)# interface s0/0/1

R1(config-if)# ppp authentication chap

R1(config-if)# no shutdown

After correcting the issue, what information does the debug output provide?

*Jun 18 12:13:57.819: %LINK-3-UPDOWN: Interface Serial0/0/1, changed state to up

*Jun 18 12:13:57.819: Se0/0/1 PPP: Using default call direction

*Jun 18 12:13:57.819: Se0/0/1 PPP: Treating connection as a dedicated line

*Jun 18 12:13:57.819: Se0/0/1 PPP: Session handle[F300005B] Session id[91]

*Jun 18 12:13:57.831: Se0/0/1 CHAP: O CHALLENGE id 1 len 23 from "R1"

*Jun 18 12:13:57.831: Se0/0/1 CHAP: I CHALLENGE id 1 len 23 from "R3"

*Jun 18 12:13:57.831: Se0/0/1 PPP: Sent CHAP SENDAUTH Request

*Jun 18 12:13:57.831: Se0/0/1 PPP: Received SENDAUTH Response PASS

*Jun 18 12:13:57.831: Se0/0/1 CHAP: Using hostname from configured hostname

*Jun 18 12:13:57.831: Se0/0/1 CHAP: Using password from AAA

*Jun 18 12:13:57.831: Se0/0/1 CHAP: O RESPONSE id 1 len 23 from "R1"

*Jun 18 12:14:01.819: Se0/0/1 PPP: Using default call direction

*Jun 18 12:14:01.819: Se0/0/1 PPP: Treating connection as a dedicated line

*Jun 18 12:14:01.819: Se0/0/1 PPP: Session handle[BC00005C] Session id[92]

*Jun 18 12:14:01.831: Se0/0/1 CHAP: O CHALLENGE id 1 len 23 from "R1"