Datasheet

Lab – Troubleshooting Basic PPP with Authentication

Keepalive set (10 sec)

CRC checking enabled

Last input 00:00:07, output 00:00:00, output hang never

Last clearing of "show interface" counters 00:51:19

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: weighted fair

Output queue: 0/1000/64/0 (size/max total/threshold/drops)

Conversations 0/1/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 1158 kilobits/sec

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

711 packets input, 35022 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

847 packets output, 36444 bytes, 0 underruns

0 output errors, 0 collisions, 73 interface resets

141 unknown protocol drops

0 output buffer failures, 0 output buffers swapped out

96 carrier transitions

DCD=up DSR=up DTR=up RTS=up CTS=up

Have all links been established? __________ No

If the answer is no, which links need to be examined? What are the possible issues?

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The serial link between R1 and R3 has not been established. Serial0/0/0 is configured with PPP

encapsulation, and the interface is enabled. Therefore, the possible issue is authentication mismatch.

b. Using the show run interface command to examine on any serial link that has not been established.

R3# show run interface s0/0/0

Building configuration...

Current configuration : 134 bytes

interface Serial0/0/0

ip address 192.168.13.2 255.255.255.252

encapsulation ppp

ppp authentication chap

clock rate 2000000

end

Resolve all problems found on the interfaces. Record the commands used to correct the configuration.

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No problems exist with the S0/0/0 configuration.

c. Use the show running-config | include username command to verify the correct username and

password configurations.

R3# show run | include username

username R2 password 0 chap123

username R3 password 0 chap123