This is the whole story, happened on a similar mother board. On CentOS7. Which has worked for more or less around three years on this hardware.
Now. This hardware works with CentOS 7. Tested.
And the behavior with NethSec is different, on the very same hardware, but with OpenWRT kernel.
Currently, due to this behavior, I’m not able to test NethSec. I don’t have any virtual hardware to allocate, I have currently no other hardware to use for this.