Datasheet
Lab – Troubleshooting Basic PPP with Authentication
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Resolve all problems found. Record the commands used to correct the configuration.
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R3(config)# no username R3 password chap123
R3(config)# username R1 password chap123
d. Use the show interface command to verify that serial links have been established.
R3# show interface s0/0/0
Serial0/0/0 is up, line protocol is up
Hardware is GT96K Serial
Internet address is 192.168.13.2/30
MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, LCP Open
Open: IPCP, CDPCP, loopback not set
Keepalive set (10 sec)
CRC checking enabled
Last input 00:00:20, output 00:00:03, output hang never
Last clearing of "show interface" counters 01:03:35
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
4392 packets input, 88310 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
3974 packets output, 74268 bytes, 0 underruns
0 output errors, 0 collisions, 994 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
1919 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
e. Have all PPP links been established?__________ Yes
f. Can PC-A ping Lo0? _________ Yes
g. Can PC-A ping PC-C? _________ No
Note: It may be necessary to disable the PC firewall for pings between the PCs to succeed.
Part 3: Troubleshoot the Network Layer
In Part 3, you will verify that Layer 3 connectivity is established on all interfaces by examining IPv4 and OSPF
configurations.