DHCP Bench is installed

1. Plug in the USB Ethernet adapter and open DHCP Bench from Applications.
2. Pick the adapter in the card menu. If the checklist asks, press Configure adapter… and enter your password (once per adapter).
3. Press Start and choose Allow when macOS asks about your local network.
4. Power on the device. When it shows Device found, press Open in browser.

Quit VMware Fusion or other VM software first: it can take the USB adapter.