RPI: Headless USB
Only works on Raspberry Pi Zero, Zero W and 4b!!!
Edit /boot/config.txt in [all] section:
dtoverlay=dwc2
cmdline.txt, after rootwait (take care the line does not break up!!)
modules-load=dwc2,g_ether g_ether.host_addr=dc:a6:32:xx:xx:xx g_ether.dev_addr=dc:a6:32:xx:xx:yy
g_ether.dev_addr is the Pi Zero interface. g_ether.host_addr is the host PC interface.
Reboot!