Lab – Troubleshooting Basic PPP with Authentication
Contents
1. Ajaj CISCO Cisco Networking Academy Mind Wide Oper Lab Troubleshooting Basic PPP with Authentication Topology Internet 2013 Cisco and or its affiliates All rights reserved This document is Cisco Public Page 1 of 8 Lab Troubleshooting Basic PPP with Authentication Addressing Table Device Interface IP Address Subnet Mask Default Gateway R1 G0 1 192 168 1 1 255 255 255 0 N A S0 0 0 DCE 192 168 12 1 255 255 255 252 N A S0 0 1 192 168 13 1 255 255 255 252 N A R2 Loo 209 165 200 225 255 255 255 252 N A S0 0 0 192 168 12 2 255 255 255 252 N A S0 0 1 DCE 192 168 23 1 255 255 255 252 N A R3 G0 1 192 168 3 1 255 255 255 0 N A S0 0 0 DCE 192 168 13 2 255 255 255 252 N A S0 0 1 192 168 23 2 255 255 255 252 N A PC A NIC 192 168 1 3 255 255 255 0 192 168 1 1 PC C NIC 192 168 3 3 255 255 255 0 192 168 3 1 Objectives Part 1 Build the Network and Load Device Configurations Part 2 Troubleshoot the Data Link Layer Part 3 Troubleshoot the Network Layer Background Scenario 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 us2. ds used to correct the configuration 2013 Cisco and or its affiliates All rights reserved This document is Cisco Public Page 7 of 8 Lab Troubleshooting Basic PPP with Authentication 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 Router Interface Summary Table Router Interface Summary Router Model Ethernet Interface 1 Ethernet Interface 2 Serial Interface 1 Serial Interface 2 1800 Fast Ethernet 0 0 Fast Ethernet 0 1 Serial 0 0 0 S0 0 0 Serial 0 0 1 S0 0 1 F0 0 F0 1 1900 Gigabit Ethernet 0 0 Gigabit Ethernet 0 1 Serial 0 0 0 S0 0 0 Serial 0 0 1 S0 0 1 G0 0 G0 1 2801 Fast Ethernet 0 0 Fast Ethernet 0 1 Serial 0 1 0 S0 1 0 Serial 0 1 1 S0 1 1 F0 0 F0 1 2811 Fast Ethernet 0 0 Fast Ethernet 0 1 Serial 0 0 0 S0 0 0 Serial 0 0 1 S0 0 1 F0 0 F0 1 2900 Gigabit Ethernet 0 0 Gigabit Ethernet 0 1 Serial 0 0 0 S0 0 0 Serial 0 0 1 S0 0 1 G0 0 G0 1 Note To find out how the router is configured look at the interfaces to identify the type of router and how many interfaces the router has There is no way to effectively list all the combinations of configurations for each router class This table includes identifiers for the possible combinations of Ethe
3. e PPP CHAP authentication and that all of the networks are reachable Note The routers used with CCNA hands on labs are Cisco 1941 Integrated Services Routers ISRs with Cisco IOS Release 15 2 4 M3 universalk9 image The switches used are Cisco Catalyst 2960s with Cisco IOS Release 15 0 2 lanbasek9 image Other routers switches and Cisco IOS versions can be used Depending on the model and Cisco IOS version the commands available and output produced might vary from what is shown in the labs Refer to the Router Interface Summary Table at the end of this lab for the correct interface identifiers Note Make sure that the routers and switches have been erased and have no startup configurations If you are unsure contact your instructor Required Resources e 3 Routers Cisco 1941 with Cisco IOS Release 15 2 4 M3 universal image or comparable e 2 Switches Cisco 2960 with Cisco IOS Release 15 0 2 lanbasek9 image or comparable e 2 PCs Windows 7 Vista or XP with a terminal emulation program such as Tera Term e Console cables to configure the Cisco IOS devices via the console ports e Ethernet and serial cables as shown in the topology 2013 Cisco and or its affiliates All rights reserved This document is Cisco Public Page 2 of 8 Lab Troubleshooting Basic PPP with Authentication Part 1 Build the Network and Load Device Configurations In Part 1 you will set up the network topology configure basic sett
4. e209 252 chap 0 0 0 0 3 area 0 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 Step 4 Save your running configuration Part 2 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 Step 1 a 2013 Cisco and or its affiliates All rights reserved This document is Cisco Public Examine the R1 configuration 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 Use the debug ppp authentication command to view real time PPP authentication output during troubleshooting R1 debug ppp authentication PPP authentication debugging is on Page 5 of 8 Lab Troubleshooting Basic PPP with Authentication Cc 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 After correcting the issue what information does the debug output provide 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 configurati
5. ings 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 2013 Cisco and or its affiliates All rights reserved This document is Cisco Public Page 3 of 8 Lab Troubleshooting Basic PPP with Authentication password cisco login Router R2 Configuration hos
6. ll links been established If the answer is no which links need to be examined What are the possible issues b 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 c 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 d Use the show interface command to verify that serial links have been established e Have all PPP links been established f Can PC A ping Lo0 g Can PC A ping PC C 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 Step 1 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 Step 2 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 comman
7. on After correcting the issue what information does the debug output provide 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 Step 2 Examine the R2 configuration a 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 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 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 2013 Cisco and or its affiliates All rights reserved This document is Cisco Public Page 6 of 8 Lab Troubleshooting Basic PPP with Authentication d Use the show ppp interface serial command for the serial interface that you are troubleshooting Has the link been established Step 3 Examine the R3 configuration a Use the show interfaces command to determine whether PPP has been established on both serial links Have a
8. rnet and Serial interfaces in the device The table does not include any other type of interface even though a specific router may contain one An example of this might be an ISDN BRI interface The string in parenthesis is the legal abbreviation that can be used in Cisco IOS commands to represent the interface 2013 Cisco and or its affiliates All rights reserved This document is Cisco Public Page 8 of 8
9. tname R2 enable secret class no ip domain lookup banner motd Unauthorized Access is Prohibited username R1 password chap123 username r3 password chap123 interface 100 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 loopback0O 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 2013 Cisco and or its affiliates All rights reserved This document is Cisco Public Page 4 of 8 Lab Troubleshooting Basic PPP with Authentication no shutdown interface s0 0 0 ip address 192 168 clock rate 128000 encapsulation ppp ppp authentication no shutdown interface s0 0 1 ip address 192 168 encapsulation ppp ppp authentication no shutdown exit router ospf 1 router id 3 3 3 3 network 192 168 13 network 192 168 23 1332 5299 2255 2295 252 chap 323 2 299 6299
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