🚀 go-pugleaf

Hi
I have been trying to get a group of 5 Indigos to keep time and I have this 
slight problem with timed since there are a few other machines running timed 
but with the wrong time on the same network.
I have been using xntpd to keep one machine set right relative to 3 others 
sync'd to 3 other radio controlled beasts and that one machine is running 
timed -M -F localhost
So it should be master and not permit its clock to be changed other than by 
the xntpd daemon.
The problem is that for the other sgi's I cannot seem to start timed so that 
they listen only to the master and ignore the other ones on the net which 
are wrong.
The problem is that the other machines are in other departments, etc and 
their SuperUsers never seem to read their email form me suggesting they set 
their clocks (which would be pointless unless everyone can be reached and 
set all their clocks before re-starting timed).
Has anyone ever found a simple solution to this or do I need re-read the man 
pages!
Maybe if I define a 'network' such that the other machines aren't part of it?
thanks
Neil