Internet sharing not delivering the expected IP address(es)

I have enabled Internet Sharing on my Mac, so that my dual-boot Windows/Linux PC can piggyback off its internet connection. It works for internet access, but the PC is on its own 192.168.2.x network, not on the same 192.168.0.x network that everything else is on. So I am unable to use certain things that only work on the same network, like my WiFi printer, and NoMachine.

I seem to recall configuring something to deliver the 192.168.2.x range, but it may be that that was the default setting.

In any case I now wish to change it so that the Linux PC is on the same network as the rest of the house, and I have gone through the process to edit /etc/bootpd.plist twice now, because I thought I may have missed something. I have changed all the occurrences of 192.168.2 to 192.168.0, and I've saved the changes. I stopped/started the service. I've rebooted both devices. And yet when I boot up the Linux PC again, it still shows 192.168.2.2. Going back to /etc/bootpd.plist on the Mac shows the old settings, as if I had not changed it.

Is there something else in control of these settings? Am I working on the wrong file?

This article [https://apple.stackexchange.com/questions/186955/specific-network-settings-for-sharing-internet-connection] may indicate that the Mac is always going to decide what IP address range to assign. But that seems to contradict what I have read elsewhere; a), that you can and should edit /etc/bootpd.plist if you don't want to use the default range, and b), that bootpd has enough smarts to find any other DHCP server on the network and will defer to that rather than attempting to assign addresses in the same range. On the other hand, I also read a warning, "check that your change to /etc/bootpd.plist hasn't been reverted," after making some changes like what I am talking about here. What is all of this telling me?

All I really want to be able to do is to use the printer and NoMachine. If I am making this harder than it needs to be, I'm all ears. But in theory, what could be simpler than just putting everything on the same network?! Ugh.