If you are having problems starting a diskless Apple II on LocalTalk over
a Kinetics FastPath, from a server residing on Ethernet, it may be because
the diskless start-up capability of Apple II workstations is designed to
work over a FastPath or other AppleTalk bridges -- but not across zones. If
your FastPath has been set up with the Ethernet as a separate zone from the
LocalTalk side, this is your problem.
You should also look at the configuration of the FastPath itself. If a
Macintosh can access the server normally from the LocalTalk side of the
network, then the Apple II should be able to start, because the same
network layers are being used for the information transfer. If a Macintosh
cannot access the server properly, then you should suspect the
configuration of the FastPath itself.