Failing to netboot

Hi Folks,

What am I missing here?

I’m trying to netboot my IPX, I have rarpd and tftp running on an rpi, and I can see rarp and tftp responses to the IPX.
Apr 27 21:54:12 pie rarpd[3850516]: RARP request from 08:00:20:c0:ff:ee on eth0
Apr 27 21:54:12 pie rarpd[3850516]: RARP response to 08:00:20:c0:ff:ee 192.168.23.211 on eth0
Apr 27 21:54:12 pie systemd[1]: Started atftpd.service - Advanced TFTP Server.
Apr 27 21:54:12 pie atftpd[104415]: Advanced Trivial FTP server started (0.8.0)
Apr 27 21:54:12 pie atftpd[104415]: Serving C0A817D3.SUN4C to ::ffff:192.168.23.211:47441

No matter what I do though I get “Transfer failed, The file downloaded does not appear to be executable.”
I’ve tried boot.net <http://boot.net/> from 9.4, 10 and 10.1, I’ve tried a generic kernel, just to see if I can get something to execute.

The DHCP server is currently running on a Ubiquiti Dream machine, the interface can make seeing what options are configured a bit difficult, but I can enter any custom options I want. Even setting the DHCP protocol number on it.

If anyone has any thoughts on what I might be missing, appreciate all the help.

Matt.