@V.Yakob, glad to see you are still around and you've gotten your Mac OS 9 to boot up!
And it looks like we've been working on similar things this month! I've succeeded to netboot Mac OS 9.2.2 with the help of Netatalk and my Mikrotik router, after going through a handful of BSDP and original BOOTP tutorials I found in the WayBack Machine. All of them had extra steps and settings I did not need after all, so I trimmed those away yesterday, and now the setup doesn't look too overly complicated.
Now, there are still 2 more things I have not yet figured out.
1) I'm not doing full BSDP handshakes between the Mac and the router, so I wonder if I can get multiple OS choices in the bootpicker if I do this. I read about the netboot versions and am not fully sure whether my PowerMac is on version 1.0 or 2.0. From what I gathered, only Netboot 2.0 can do this.
2) How to make changes persist outside Application HD
. I tried changing some system settings and dragging a PDF into NetBoot HD, but all those changes and the file went away after rebooting. I have a shadow image that some netbooting documents talked about, and I can tell that changes have been happening inside it. I even saw what might be the resource fork for the PDF I dragged in, but the icon for the PDF doesn't show. I'm not too sure yet whether that Macintosh Manager in X Server has anything to do with this.
Because of these 2, I might have to try setting up a Server 10.5 hackintosh on VMWare, and figure out how the machines are talking then, and then try to recreate the process with my router and Linux box.
Regardless, I think it's so cool I can do this now. I've been eager to try out Mac OS and some software in the other languages, and I think the netbooting method is a nice way to do this without messing with my SSD.