How can we force the campus DHCP server to assign a new dynamic IP 
address to a machine, instead of just re-assigning it its latest IP address?

We seem to have rogue machine in the building set up to use an IP in 
the dynamic range as its static IP address, so when DHCP gives that 
address to our machine we get an IP conflict error.  We have tried 
releasing & renewing the IP, but that just gets us back the same IP 
address that has the confilict.  We also tried unregistering the 
machine from the campus DHCP server, then re-registering it, with the 
same result.

So we want to tell the DHCP server, "Please give us a dynamic IP that 
is different from the one we already have, thanks."  How do we do that?

Thanks,
-- dkm