Just tested 2 usb-ethernet adapters on the Brume-W on Ubuntu. They both work! I had an old Trendnet TU2-ETG from some years ago, plugged it into the usb and it works! Also just bought a j5create usb-ethernet model: JUE130 from BestBuy. Plugged it in, and it works as well! They both show up when you run ip a. Then sudo ip link "eth-interface" up followed by sudo dhclient "eth-interface" that should get an ip address. Can add these interfaces into the /etc/netplan.conf file as well to have them come up automatically at boot. I’ve also got them both plugged into the usb port at the same time through a usb-hub, and they both show up using ip a. Based on this testing I would guess that most any usb-ethernet adapter will work. The only bummer is that the Brume only has USB2.0 apart from its other higher end specs. So you have your USB2.0 theoretical speeds of 480Mbps / number of interfaces, if you are trying to expand ethernet connections. Otherwise I would probably use a smart-switch in conjunction with the Brume router, and use VLANS. But that’s another project I don’t have time for yet, which is why I wanted to test a usb hub with usb-ethernet adapters.