Capture a network trace without installing Wireshark

Products

• Endpoint Protection
• Data Loss Prevention

Issue/Introduction

Obtaining a network packet capture or trace without installing Wireshark onto the system.

Environment

Windows 7/8.x/10 all releases

Windows Server 2008 R2/2012/2012 R2/2016/2019

SEP 14.x

DLP 15.X and 16.0

Resolution

You can use the following "netsh" command to generate a packet capture and have it continue on reboot.

• Launch an elevated command prompt using the Run As Administrator option
• Enter the following command and press Enter (Note: you can modify the location and the size of the file in the below command)

netsh trace start capture=yes report=yes tracefile=C:\temp\tracefile.etl persistent=yes maxsize=250

• The trace configuration will be displayed similar to the following:

C:\Windows\system32>netsh trace start capture=yes report=yes tracefile=C:\temp\tracefile.etl
 persistent=yes

Trace configuration:
-------------------------------------------------------------------
Status:             Running
Trace File:         C:\temp\tracefile.etl
Append:             Off
Circular:           On
Max Size:           250 MB
Report:             On

C:\Windows\system32>

• To stop the trace launch an elevated command prompt and type "netsh trace stop".  This will create two files Tracefile.cab and tracefile.etl. File names and location will be displayed in command prompt window after data collection is finished.
• Zip up the files and upload them to the support case.
• You can use Etl2Pcapng to convert it to pcap file that can then be read with Wireshark.

 

Additional Information

The following Microsoft links have more information on this topic.

https://techcommunity.microsoft.com/t5/iis-support-blog/capture-a-network-trace-without-installing-anything-amp-capture/ba-p/376503

https://techcommunity.microsoft.com/t5/core-infrastructure-and-security/converting-etl-files-to-pcap-files/ba-p/1133297