NMI watchdog detectedhard LOCKUP on cpu1

[mr44er]

This means that WOL is activated for this NIC, right?

Yes

How to turn off?

Should normally be possible via BIOS.
If not there is another way (also for cards): https://zedt.eu/tech/how-to-enable-wol-and-pxe-boot-on-an-intel-server-network-adapter/
I have done this once with a very old card. I think it was parameter -WOLD for disabling.
Try older packages, if your card is not supported by the latest package.
Also there should be a dos executable, which I ran from a prepared freedos-bootstick.

 

[dejhost]

I finally got it working: I upgraded to pve-kernel 5.19. The NIC showed up in the web-GUI under "Networking". After activating them (and setting autostart=yes), they seem to work fine.

Thank you very much for your support, mr44er.

 

[mr44er]

I hope it's the solution for the long run.