His main issue will be that the PowerPC architecture has no “Devices” control panel, and so it will be a lot of guessing. I don’t know it there’s command line tool, but that might help. This was never an issue on the Mac running BeOS as it was all PCI and things either worked or they didn’t… lol. The BeBox was too short lived for this to be much of an issue because most people knew what they were doing with them back then and most still run with the original hardware these days - as this is the alternative!!
I will say that I don’t believe the BeBox supported anything past 10mb, Base10T was the best card officially supported.