First make sure you have set up your splunk forwarder with a domain account (not the local user option).
This domain account must have corresponding administrative rights, so that the forwarder kann access the filer.
Assuming you already have enabled cifs audit on your netapp, put this in your inputs.conf of your forwarder:
[monitor://\\filer_host\c$\etc\log\*.evt]
disabled = 0
index=whateveryoulike
This will do the trick.
Regards,
Phil
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