@TeddyAstie Thanks for the input.
This is what I was afraid of somehow In the meantime (a few months ago) I have done some tests with the machine.
Installed opnsense as described in the opening post and directly to the device without xcp-ng just to see if there is any issue. The result is the same (i have used in both cases the same settings and same spoofed mac) the spoofing did work without xcp-ng, this is why I was hoping that something can be done via xcp.
@olivierlambert said in NIC Passthrough with mac spoofing:
Out of curiosity, what about SRIOV in that case?
Regarding SRIOV right now its not possible for me to check if thats enabled/supported in the bios but its a good point, thanks Will take about 3-4 weeks to check.