Enterprise Networking
Abdulmalek
Week5LaboratoryPracticum2_Graded.docx
ICT3051 Enterprise Networking
Week-5 Laboratory Practicum 1
Troubleshooting Basic PPP with Authentication
Task
The routers at your company were configured by an inexperienced network engineer. Several errors in the configuration have resulted in connectivity issues. Your manager has asked you to troubleshoot and correct the configuration errors and document your work. Using your knowledge of PPP and standard testing methods, find and correct the errors. Ensure that all of the serial links use PPP CHAP authentication, and that all of the networks are reachable.
Objectives
Part 1: Build the Network and Load Device Configurations
Part 2: Troubleshoot the Data Link Layer
Part 3: Troubleshoot the Network Layer
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Part 1: Build the Network and Load Device Configurations
In Part 1, you will set up the network topology, configure basic settings on the PC hosts, and load configurations on the routers.
Step 1: Cable the network as shown in the topology.
Step 2: Configure the PC hosts.
Step 3: Load router configurations.
Load the following configurations into the appropriate router. All routers have the same passwords. The privileged EXEC mode password is class. The password for console and vty access is cisco. All serial interfaces should be configured with PPP encapsulation and authenticated with CHAP using the password of chap123.
Router R1 Configuration:
hostname R1
enable secret class
no ip domain lookup
banner motd #Unauthorized Access is Prohibited!#
username R2 password chap123
username R3 password chap123
interface g0/1
ip address 192.168.1.1 255.255.255.0
no shutdown
interface s0/0/0
ip address 192.168.12.1 255.255.255.252
clock rate 128000
encapsulation ppp
ppp authentication chap
interface s0/0/1
ip address 192.168.31.1 255.255.255.252
encapsulation ppp
ppp authentication pap
exit
router ospf 1
router-id 1.1.1.1
network 192.168.1.0 0.0.0.255 area 0
network 192.168.12.0 0.0.0.3 area 0
network 192.168.13.0 0.0.0.3 area 0
passive-interface g0/1
exit
line con 0
password cisco
logging synchronous
login
line vty 0 4
password cisco
login
Router R2 Configuration:
hostname R2
enable secret class
no ip domain lookup
banner motd #Unauthorized Access is Prohibited!#
username R1 password chap123
username r3 password chap123
interface lo0
ip address 209.165.200.225 255.255.255.252
interface s0/0/0
ip address 192.168.12.2 255.255.255.252
encapsulation ppp
ppp authentication chap
no shutdown
interface s0/0/1
ip address 192.168.23.1 255.255.255.252
clock rate 128000
no shutdown
exit
router ospf 1
router-id 2.2.2.2
network 192.168.12.0 0.0.0.3 area 0
network 192.168.23.0 0.0.0.3 area 0
default-information originate
exit
ip route 0.0.0.0 0.0.0.0 loopback0
line con 0
password cisco
logging synchronous
login
line vty 0 4
password cisco
login
Router R3 Configuration:
hostname R3
enable secret class
no ip domain lookup
banner motd #Unauthorized Access is Prohibited!#
username R2 password chap123
username R3 password chap123
interface g0/1
ip address 192.168.3.1 255.255.255.0
no shutdown
interface s0/0/0
ip address 192.168.13.2 255.255.255.252
clock rate 128000
encapsulation ppp
ppp authentication chap
no shutdown
interface s0/0/1
ip address 192.168.23.2 255.255.255.252
encapsulation ppp
ppp authentication chap
no shutdown
exit
router ospf 1
router-id 3.3.3.3
network 192.168.13.0 0.0.0.3 area 0
network 192.168.23.0 0.0.0.3 area 0
passive-interface g0/1
line con 0
password cisco
logging synchronous
login
line vty 0 4
password cisco
login
Save your running configuration.
Troubleshoot the Data Link Layer
In Part 2, you will use show commands to troubleshoot data link layer issues. Be sure to verify settings, such as clock rate, encapsulation, CHAP, and usernames/passwords.
Examine the R1 configuration.
3. Use the show interfaces command to determine whether PPP has been established on both serial links.
From the show interfaces results for S0/0/0 and S0/0/1, what are possible issues with the PPP links?
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Use the debug ppp authentication command to view real-time PPP authentication output during troubleshooting.
R1# debug ppp authentication
PPP authentication debugging is on
Use the show run interface s0/0/0 command to examine the settings on S0/0/0.
Resolve all problems found for S0/0/0. Record the commands used to correct the configuration.
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After correcting the issue, what information does the debug output provide?
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Use the show run interface s0/0/1 command to examine the settings on S0/0/1.
Resolve all problems found for S0/0/1. Record the commands used to correct the configuration.
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After correcting the issue, what information does the debug output provide?
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Use the no debug ppp authentication or undebug all command to turn off the debug PPP output.
Use the show running-config | include username command to verify the correct username and password configurations.
Resolve all problems found. Record the commands used to correct the configuration.
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Examine the R2 configuration.
Use the show interfaces command to determine if PPP has been established on both serial links.
Have all links been established? ______________
If the answer is no, which links need to be examined? What are the possible issues?
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Use the show run interface command to examine links that have not been established.
Resolve all problems found for the interfaces. Record the commands used to correct the configuration.
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Use the show running-config | include username command to verify the correct username and password configurations.
Resolve all problems found. Record the commands used to correct the configuration.
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Use the show ppp interface serial command for the serial interface that you are troubleshooting.
Has the link been established? ______________
Examine the R3 configuration.
3. Use the show interfaces command to determine whether PPP has been established on both serial links.
Have all links been established? ______________
If the answer is no, which links need to be examined? What are the possible issues?
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Using the show run interface command to examine on any serial link that has not been established.
Resolve all problems found on the interfaces. Record the commands used to correct the configuration.
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Use the show running-config | include username command to verify the correct username and password configurations.
Resolve all problems found. Record the commands used to correct the configuration.
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3. Use the show interface command to verify that serial links have been established.
Have all PPP links been established? ______________
Can PC-A ping Lo0? ______________
Can PC-A ping PC-C? ______________
Note: It may be necessary to disable the PC firewall for pings between the PCs to succeed.
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.
Verify that the interfaces listed in the Addressing Table are active and configured with the correct IP address information.
Issue the show ip interface brief command on all routers to verify that the interfaces are in an up/up state.
Resolve all problems found. Record the commands used to correct the configuration.
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Verify OSPF Routing
Issue the show ip protocols command to verify that OSPF is running and that all networks are advertised.
Resolve all problems found. Record the commands used to correct the configuration.
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Can PC-A ping PC-C? ______________
If connectivity does not exist between all hosts, then continue troubleshooting to resolve any remaining issues.
Note: It may be necessary to disable the PC firewall for pings between the PCs to succeed.
