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If I remember correctly, you can request from Hostmaster.msu.edu that a set of machines be assigned a specific IP range from campus DHCP. You may have to provide the MAC address of all DHCP clients involved. That should resolved this issue. Firm. -----Original Message----- From: MSU Network Administrators Group [mailto:[log in to unmask]] On Behalf Of David McFarlane Sent: Thursday, February 26, 2009 4:06 PM To: [log in to unmask] Subject: [MSUNAG] How to force a new IP address from DHCP? 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