So, here's the situation. I have an Rasbperry Pi 3 running OMV. I have an Raspberry Pi Zero that's running Raspbian Lite, that I have set up as a USB Ethernet Gadget – meaning that it gets power and internet access from a single USB cable. What I want to do is to plug the RPi0 into the OMV!RPi3, where the RPi0 is showing up as internet interface usb0, and bridge connections usb0 and eth0, exposing the RPi0 to the rest of the network. The problem being that usb0 doesn't show up in OMV. Is there some way to make usb0 show up in the list of network interfaces in OMV, or is this more of a Debian "muck around in the command line and learn about VLANs and related topics" type of thing? I think I'm the only person trying this out, and really it's to save a few bucks and maybe a port or two. But then I could say I did this weird setup, and isn't that half the fun?
Thanks so much to anyone who considers helping me out.