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Analyzing a Netsh Trace with Wireshark

Windows ships with an inbox packet capture component called ndiscap. A capture can be collected using netsh within an elevated CMD prompt:

netsh trace start capture=yes tracefile=c:\nettrace-boot.etl persistent=yes maxsize=4096
 
<Reproduce the issue>

netsh trace stop

Netsh outputs a .etl file; to analyze the trace in Wireshark, the .etl file will need to be converted to a supported file format. The tool etl2pcapng can generate a .cap file from an .etl file.

More information and prebuilt binaries are available here: https://github.com/microsoft/etl2pcapng

Within the same directory as the executable, run the following command to perform the conversion.

etl2pcapng.exe nettrace-boot.etl test.cap

Note, .etl files can be analyzed using Microsoft Network Monitor, Microsoft Message Analyzer and PerfView. However, I have found Wireshark to be the most intuitive.

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