Toshiba E-STUDIO190F Service Manual page 109

4.6.2. Testing the TCP/IP Network
It is beyond the scope of this Service Manual to cover Networking in detail, there are many excellent
manuals on this subject, but we hope the information in this section will aid with your troubleshooting efforts.
In most cases, the Network Administrator will be able to provide you with needed information or assistance.
When encountering Network problems during an onsite service call or during the installation stage, try to
isolate the steps that are not being completed so that you can quickly locate the components that don't
work. It is best to organize your troubleshooting efforts by understanding what should be happening, then
you can trace the path and see where the problem is occurring.
In our case, we use TCP/IP for transportation of data from one system to another, which involves a whole
series of events occurring throughout a number of different layers.
As with all networking, TCP/IP works better when its plugged in, therefore, start your troubleshooting by
checking the Physical Connectivity first, the cable(s).
In our examples, we'll use several simple tools readily available in the DOS command-line utility for
troubleshooting. There are many other utilities available for checking more detailed information, some are
Free of charge, others are available for a nominal fee.
1. System Diagram Model
Ask the customer to provide you with the Pre-Installation Information form, that was filled out by the
Network Administrator.
A description or system diagram for the unit, including its physical address, email server and DNS
server is required.
Network Configuration
Domain Name: labo.mgcs.com
Network A
[192.168.3.0]
"ping"
PC Client
[192.168.3.4]
ec4.labo.mgcs.com
[192.168.3.254]
Internet Fax
Toshiba Device
[192.168.3.5]
ef1.labo.mgcs.com
Network D
[210.232.71.18]
js2.labo.mgcs.com
SMTP/POP
Server
sv2.labo.mgcs.com
[192.168.1.2]
[192.168.1.253]
Router (R1)
Network C
[192.168.4.0]
109
PC Client
DNS
Server
sv1.labo.mgcs.com
[192.168.1.1]
PC Client
Network B
[192.168.1.4]
[192.168.1.0]
ec5.labo.mgcs.com
Hub
[192.168.4.1]
fmrt7.labo.mgcs.com
WAN
PC Client