Information Technology Reference
In-Depth Information
Task 5: Troubleshoot the ISP Router
Begin troubleshooting at the host connected to the ISP router.
Step 1.
From the host PC3, is it possible to ping PC1?
yes
From the host PC3, is it possible to ping PC2?
no
From the host PC3, is it possible to ping the default gateway?
yes
Examine the ISP router to find possible configuration errors.
Step 2.
Begin by viewing the summary of status information for each interface on the router.
Are there any problems with the status of the interfaces?
no
If there are any problems with the status of the interfaces, record any commands that will
be necessary to correct the configuration errors.
If you have recorded any commands, apply them to the router configuration now.
Step 3.
View the summary of the status information.
Step 4.
If any changes were made to the configuration in the previous step, view the summary of
the status information for the router interfaces again.
Does the information in the interface status summary indicate any configuration errors?
no
If the answer is
yes
, troubleshoot the interface status of the interfaces again.
Troubleshoot the static routing configuration on the ISP router.
Step 5.
Begin by viewing the routing table.
What networks are shown in the routing table?
10.0.0.0/23
172.16.0.0/24
172.20.0.0/24
192.168.1.0/24
Are there any problems with the routing configuration?
In the routing table, the subnet mask on the 10.0.0.0 network should be /22. The route
summarization for the 10.45.1.0/24 and 10.45.2.0/24 networks has been done incorrectly.
If there are any problems with the routing configuration, record any commands that will be
necessary to correct the configuration errors.
configure terminal
no ip route 10.45.0.0 255.255.254.0 Serial0/1
ip route 10.45.0.0 255.255.252.0 Serial0/1
If you have recorded any commands, apply them to the router configuration now.
Step 6.
