Diagnosing Low-Level Network Problems - Fluke DTX-1800 Technical Reference Handbook

Diagnosing Low-Level Network
Problems
The DTX-NSM module helps you troubleshoot links and
diagnose network problems up through layer 3 of the OSI
(Open Systems Interconnect) 7-layer model. It can also
indicate problems at higher levels. Higher-level problems
No ping response, limited responses, or ping times seem high
•
Wiring fault on the link.
•
Device is turned off.
•
For static IP address assignment, incorrect address or subnet mask in Setup.
•
A network fault, condition (such as network congestion), or security setting is preventing the device from answering.
•
Since ping requests are low-priority traffic, devices may not respond to all requests.
Table 11-2. Diagnosing Low-Level Network Problems
To evaluate ping times, you should compare current results with results
taken when the network was operating normally.

Diagnosing Low-Level Network Problems

are usually addressed by a network technician or
administrator using a network tester or analyzer.
Table 11-2 lists common causes of symptoms you can detect
with the DTX-NSM module.
Note
Verifying Network Service
-continued-
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