CCNA RSE Lab: 2.3.2.4 Troubleshooting IPv4 and IPv6 Static Routess

CCNA RSE Lab: 2.3.2.4 Troubleshooting IPv4 and IPv6 Static Routess

Topology

Addressing Table

Device Interface IP Address Default Gateway
HQ G0/1 192.168.0.1/25
2001:DB8:ACAD::1/64
FE80::1 link-local
N/A
S0/0/0 (DCE) 10.1.1.2/30
2001:DB8:ACAD::20:2/64
N/A
S0/0/1 192.168.0.253/30
2001:DB8:ACAD:2::1/30
N/A
ISP G0/0 172.16.3.1/24
2001:DB8:ACAD:30::1/64
FE80::1 link-local
N/A
S0/0/0 10.1.1.1/30
2001:DB8:ACAD:20::1 /64
N/A
BRANCH G0/1 192.168.1.1/24
2001:DB8:ACAD:1::1/64
FE80::1 link-local
N/A
S0/0/0(DCE) 192.168.0.254/30
2001:DB8:ACAD:2::2/64
N/A
S1 VLAN 1 N/A N/A
S3 VLAN 1 N/A N/A
PC-A NIC 192.168.0.3/25
2001:DB8:ACAD::3/64
192.168.0.1
FE80::1
Web Server NIC 172.16.3.3/24
2001:DB8:ACAD:30::3/64
172.16.3.1
FE80::1
PC-C NIC 192.168.1.3/24
2001:DB8:ACAD:1::3/64
192.168.1.1
FE80::1

Objectives
Part 1: Build the Network and Configure Basic Device Settings
Part 2: Troubleshoot Static Routes in an IPv4 Network
Part 3: Troubleshoot Static Routes in an IPv6 Network

Background / Scenario
As a network administrator, you must be able to configure routing of traffic using static routes. Understanding how to configure and troubleshoot static routing is a requirement. Static routes are commonly used for stub networks and default routes. Your company’s ISP has hired you to troubleshoot connectivity issues on the network. You will have access to the HQ, BRANCH, and the ISP routers.

In this lab, you will begin by loading configuration scripts on each of the routers. These scripts contain errors that will prevent end-to-end communication across the network. You will need to troubleshoot each router to determine the configuration errors, and then use the appropriate commands to correct the configurations. When you have corrected all of the configuration errors, the hosts on the network should be able to communicate with each other.

Note: The routers used with CCNA hands-on labs are Cisco 1 941 Integrated Services Routers (ISRs) with Cisco IOS Release 1 5.2(4)M3 (universalk9 image). The switches used are Cisco Catalyst 2960s with Cisco IOS Release 1 5.0(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.

Instructor Note: Refer to the Instructor Lab Manual for the procedures to initialize and reload devices.

Required Resources

  • 3 Routers (Cisco 1941 with Cisco IOS Release 15.2(4)M3 universal image or comparable)
  • 2 Switches (Cisco 2960 with Cisco IOS Release 15.0(2) lanbasek9 image or comparable)
  • 3 PCs (Windows 7, Vista, or XP with terminal emulation program, such as Tera Term)
  • Console cables to configure the Cisco IOS devices via the console ports
  • Ethernet and serial cables as shown in the topology

Part 1: Build the Network and Configure Basic Device Settings

In Part 1 , you will set up the network topology and configure the routers and switches with some basic settings, such as passwords and IP addresses. Preset configurations are also provided for you for the initial router configurations. You will also configure the IP settings for the PCs in the topology.

Step 1: Cable the network as shown in the topology.
Attach the devices as shown in the topology diagram and cable, as necessary.

Step 2: Initialize and reload the routers and switches.

Step 3: Configure basic settings for each router.
a. Disable DNS lookup.
b. Configure device name as shown in the topology.
c. Assign class as the privileged EXEC mode password.
d. Assign cisco as the console and vty passwords.
e. Configure logging synchronous to prevent console messages from interrupting command entry.

Step 4: Configure hosts and Web Server.
a. Configure IP addresses for IPv4 and IPv6.
b. Configure IPv4 default gateway.

Step 5: Load router configurations.

Router HQ

Router ISP

Router BRANCH

Part 2: Troubleshoot Static Routes in an IPv4 Network

IPv4 Addressing Table

Device Interface IP Address Subnet Mask Default Gateway
HQ G0/1 192.168.0.1 255.255.255.0 N/A
S0/0/0 (DCE) 10.1.1.2 255.255.255.252 N/A
S0/0/1 192.168.0.253 255.255.255.252 N/A
ISP G0/0 172.16.3.1 255.255.255.0 N/A
S0/0/0 10.1.1.1 255.255.255.252 N/A
BRANCH G0/1 192.168.1.1 255.255.255.0 N/A
S0/0/0(DCE) 192.168.0.254 255.255.255.252 N/A
S1 VLAN 1 192.168.0.11 255.255.255.128 192.168.0.1
S3 VLAN 1 192.168.1.11 255.255.255.0 192.168.1.1
PC-A NIC 192.168.0.3 255.255.255.128 192.168.0.1
Web Server NIC 172.16.3.3 255.255.255.0 172.16.3.1
PC-C NIC 192.168.1.3 255.255.255.0 192.168.1.1

Step 1: Troubleshoot the HQ router.
The HQ router is the link between the ISP router and the BRANCH router. The ISP router represents the outside network while the BRANCH router represents the corporate network. The HQ router is configured with static routes to ISP and BRANCH networks.

a. Display the status of the interfaces on HQ. Enter show ip interface brief. Record and resolve any issues as necessary.
The interface g0/1 is status administratively down and protocol down. Issue the no shutdown command on interface g0/1 to resolve the issue.

b. Ping from HQ router to BRANCH router (192.168.0.254). Were the pings successful? ________ No
c. Ping from HQ router to ISP router (10.1.1.1). Were the pings successful? ________ Yes
d. Ping from PC-A to the default gateway. Were the pings successful? ________ Yes
e. Ping from PC-A to PC-C. Were the pings successful? ________ No
f. Ping from PC-A to Web Server. Were the pings successful? ________ No
g. Display the routing table on HQ. What non-directly connected routes are shown in the routing table?
static route to 172.16.3.0/24 via 10.1.1.1 . no route to 192.168.1.0/24

h. Based on the results of the pings, routing table output, and static routes in the running configuration, what can you conclude about network connectivity?
There is a static route to PC-C’s network but it does not show in the route table, need to re-enter route with correct destination IP. There is a static route to the 172.16.3.0 network but the Web Server is not reachable.

i. What commands (if any) need to be entered to resolve routing issues? Record the command(s).

j. Repeat any of the steps from b to f to verify whether the problems have been resolved. Record your observations and possible next steps in troubleshooting connectivity.
The routing problems have not been resolved. The HQ router still cannot ping the BRANCH router. This may indicate there is an issue on BRANCH router that is preventing PC-A from pinging PC-C successfully. The HQ router can reach ISP router, but PC-A cannot ping Web Server. There may be an issue on the ISP router.

Step 2: Troubleshoot the ISP router.
For the ISP router, there should be a route to HQ and BRANCH routers. One static route is configured on ISP router to reach the 192.168.1.0/24, 192.168.0.0/25, and 192.168.0.252/30 networks.

a. Display the status of interfaces on ISP. Enter show ip interface brief. Record and resolve any issues as necessary.
The IP address for G0/0 is incorrectly configured.

b. Ping from the ISP router to the HQ router (10.1.1.2). Were the pings successful? ________ Yes
c. Ping from Web Server to the default gateway. Were the pings successful? ________ Yes
d. Ping from Web Server to PC-A. Were the pings successful? ________ No
e. Ping from Web Server to PC-C. Were the pings successful? ________ No
f. Display the routing table on ISP. What non-directly connected routes are shown in the routing table?
Static route to 192.168.1.0/24 via 10.1.1.2 No route to 192.168.0.252/30

g. Based on the results of the pings, routing table output, and static routes in the running configuration, what can you conclude about network connectivity?
A summary route to 192.168.0.0/23 is needed to reach both 192.168.1.0/24 and 192.168.0.252/30 network.

h. What commands (if any) need to be entered to resolve routing issues? Record the command(s). (Hint: ISP only requires one summarized route to the company’s networks 192.168.1.0/24, 192.168.0.0/25, and 192.168.0.252/32.)

i. Repeat any of the steps from b to e to verify whether the problems have been resolved. Record your observations and possible next steps in troubleshooting connectivity.
After the correction, Web Server can reach PC-A. However, Web Server still cannot ping PC-C. There are still more unresolved issues in the network.

Step 3: Troubleshoot the BRANCH router.
For the BRANCH router, a default route is set to reach the rest of the network and ISP.

a. Display the status of the interfaces on BRANCH. Enter show ip interface brief. Record and resolve any issues, as necessary.

b. Ping from the BRANCH router to the HQ router (192.168.0.253). Were the pings successful? ________ Yes
c. Ping from PC-C to the default gateway. Were the pings successful? ________ Yes
d. Ping from PC-C to PC-A. Were the pings successful? ________ No
e. Ping from PC-C to Web Server. Were the pings successful? ________ No
f. Display the routing table on BRANCH. What non-directly connected routes are shown in the routing table?
None.

g. Based on the results of the pings, routing table output, and static routes in the running configuration, what can you conclude about network connectivity?
No static routes are displayed in the routing table. The default route was configured incorrectly.

h. What commands (if any) need to be entered to resolve routing issues? Record the command(s).

i. Repeat any of the steps from b to e to verify whether the problems have been resolved. Record your observations and possible next steps in troubleshooting connectivity.

Part 3: Troubleshoot Static Routes in an IPv6 Network

Device Interface IPv6 Address Prefix Length Default Gateway
HQ G0/1 2001:DB8:ACAD::1 64 N/A
S0/0/0 (DCE) 2001:DB8:ACAD::20:2 64 N/A
S0/0/1 2001:DB8:ACAD:2::1 64 N/A
ISP G0/0 2001:DB8:ACAD:30::1 64 N/A
S0/0/0 2001:DB8:ACAD:20::1 64 N/A
BRANCH G0/1 2001:DB8:ACAD:1 ::1 64 N/A
S0/0/0(DCE) 2001:DB8:ACAD:2::2 64 N/A
PC-A NIC 2001:DB8:ACAD::3 64 FE80::1
Web Server NIC 2001:DB8:ACAD:30::3 64 FE80::1
PC-C NIC 2001:DB8:ACAD:1 ::3 64 FE80::1

Step 1: Troubleshoot the HQ router.
The HQ router is the link between the ISP router and the BRANCH router. The ISP router represents the outside network while the BRANCH router represents the corporate network. The HQ router is configured with static routes to both the ISP and the BRANCH networks.

a. Display the status of the interfaces on HQ. Enter show ipv6 interface brief. Record and resolve any issues, as necessary.
The IPv6 address for S0/0/1 is incorrectly configured.

b. Ping from the HQ router to the BRANCH router (2001:DB8:ACAD:2::2). Were the pings successful?——-Yes
c. Ping from the HQ router to the ISP router (2001 :DB8:ACAD:20::1). Were the pings successful? ________ No
d. Ping from PC-A to the default gateway. Were the pings successful? ________ Yes
e. Ping from PC-A to Web Server. Were the pings successful? ________ No
f. Ping from PC-A to PC-C. Were the pings successful? ________ No
g. Display the routing table by issuing a show ipv6 route command. What non-directly connected routes are shown in the routing table?

Static route to 2001:DB8:ACAD:1::/64 via 2001:DB8:ACAD:2::2
Static route to 2001:DB8:ACAD:30::/64 via 2001:DB8:ACAD::20:1

h. Based on the results of the pings, routing table output, and static routes in the running configuration, what can you conclude about network connectivity?
Static route to 2001:DB8:ACAD:30::/64 has an incorrectly configured next hop address.

i. What commands (if any) need to be entered to resolve routing issues? Record the command(s).

j. Repeat any of the steps from b to f to verify whether the problems have been resolved. Record your observations and possible next steps in troubleshooting connectivity.
The routing problems have not been resolved. The HQ router still cannot ping ISP router. The ISP router probably has IP address issue. PC-A still cannot ping PC-C and Web Server.

Step 2: Troubleshoot the ISP router.
On the ISP router, one static route is configured to reach all the networks on HQ and BRANCH routers.

a. Display the status of the interfaces on ISP. Enter show ipv6 interface brief. Record and resolve any issues, as necessary.
The IPv6 address for S0/0/0 is incorrectly configured.

b. Ping from the ISP router to the HQ router (2001:DB8:ACAD:20::2). Were the pings successful? ________ Yes
c. Ping from Web Server to the default gateway. Were the pings successful? ________ Yes
d. Ping from Web Server to PC-A. Were the pings successful? ________ Yes
e. Ping from Web Server to PC-C. Were the pings successful? ________ No
f. Display the routing table. What non-directly connected routes are shown in the routing table?
Static route to 2001:DB8:ACAD::/62 via 2001:DB8:ACAD:20::2

g. Based on the results of the pings, routing table output, and static routes in the running configuration, what can you conclude about network connectivity?
No issues with the static route

h. What commands (if any) need to be entered to resolve routing issues? Record the command(s).
None

i. Repeat any of the steps from b to e to verify whether the problems have been resolved. Record your observations and possible next steps in troubleshooting connectivity.
Not all routing issues have been resolved. Web Server still cannot ping PC-C.

Step 3: Troubleshoot the BRANCH router.
For the BRANCH routers, there is a default route to the HQ router. This default route allows the BRANCH network to the ISP router and Web Server.

a. Display the status of the interfaces on BRANCH. Enter show ipv6 interface brief. Record and resolve any issues, as necessary.
All interfaces were configured correctly according to the Addressing Table.

b. Ping from the BRANCH router to the HQ router (2001:DB8:ACAD:2::1 ). Were the pings successful? ________ Yes
c. Ping from the BRANCH router to the ISP router (2001:DB8:ACAD:20::1). Were the pings successful? ________ No
d. Ping from PC-C to the default gateway. Were the pings successful? ________ Yes
e. Ping from PC-C to PC-A. Were the pings successful? ________ No
f. Ping from PC-C to Web Server. Were the pings successful? ________ No
g. Display the routing table. What non-directly connected routes are shown in the routing table?
None

h. Based on the results of the pings, routing table output, and static routes in the running configuration, what can you conclude about network connectivity?
No default route is displayed in the table. The next-hop address was incorrectly configured.

i. What commands (if any) need to be entered to resolve routing issues? Record the command(s).

j. Repeat any of the steps from b to f to verify whether the problems have been resolved. Record your observations and possible next steps in troubleshooting connectivity.

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
(F0/0)
Fast Ethernet 0/1
(F0/1)
Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)
1900 Gigabit Ethernet 0/0
(G0/0)
Gigabit Ethernet 0/1
(G0/1)
Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)
2801 Fast Ethernet 0/0
(F0/0)
Fast Ethernet 0/1
(F0/1)
Serial 0/1 /0 (S0/1 /0) Serial 0/1 /1 (S0/1 /1)
2811 Fast Ethernet 0/0
(F0/0)
Fast Ethernet 0/1
(F0/1)
Serial 0/0/0 (S0/0/0) Serial 0/0/1 (S0/0/1)
2900 Gigabit Ethernet 0/0 (G0/0) Gigabit Ethernet 0/1 (G0/1) Serial 0/0/0(S0/0/0) Serial 0/0/1 (S0/0/1)
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 Ethernet 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.

Device Configs

Router HQ (Corrected)

Router ISP (Corrected)

Router BRANCH (Corrected)

More Resources

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Prasanna

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