Troubleshooting The Network; Overview; Making A Check Using A Loopback Address; Making A Check Using A Local Host Address - Canon imageRUNNER 2270 Service Manual

2.4 Troubleshooting the Network

2.4.1 Overview

The instructions that follow apply only when the machine is connected to a network.
If an attempt to connect to the network fails, the following may be suspected:
a.the connection between the machine and the network is faulty.
b.the machine's TCP/IP setting is faulty.
c.the user's network is faulty.
d.the main controller PCB is faulty.
Make checks by referring to the following detailed instructions:

2.4.2 Making a Check Using a Loopback Address

A loopback address will return before it reaches the network controller. When you execute
PING using a loopback address, you can find out whether the machine's TCP/IP setting is
correct.
1) Enter the appropriate loopback address (127.0.0.1) for PING.
- If 'NG', check the machine's TCP/IP setting once again, and execute PING once again.
- If 'OK', go to the next check.

2.4.3 Making a Check Using a Local Host Address

A local host address is the IP address of the machine. When you execute PING using the
address, it will return after it has reached the network controller so that you will be able to
find out whether the network controller (main controller PCB) is free of a fault or not.
1) Enter the IP address of the machine for PING.
If 'NG' is indicated, perform the following, and execute PING once again:
- if the IP address of the machine is faulty, check to be sure that the IP address setting is
correct or, as necessary, report to the system administrator to see if the IP address is valid.
- if the main controller PCB is faulty, replace the PCB.
If 'OK' is indicated, suspect a fault in the user's network environment. Report to the system
administrator for appropriate remedial action.
Chapter 2
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