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You could also use something like nmap to give you the likely vendor of the rogue machine, so you had a good basis to work off of when it came to tracking them down, and then follow up with a more, um, personal method of troubleshooting. Remember, gloved hands help keep from leaving marks. Seriously though, the DHCP server is pretty sticky - I believe that once you've registered a machine it will keep assigning that IP to the same machine for quite a while. I don't know if unregistering the machine from dhcp.msu.edu and re-registering it will help. AFAIK, the period of "quite a while" is on the order of months. ---- Jack Kramer Computer Systems Specialist University Relations, Michigan State University 517-884-1231 ________________________________ From: Al Puzzuoli <[log in to unmask]> Reply-To: Al Puzzuoli <[log in to unmask]> Date: Thu, 26 Feb 2009 19:19:51 -0500 To: <[log in to unmask]> Subject: Re: [MSUNAG] How to force a new IP address from DHCP? How about this: Bring up the machine in question, let it register and obtain the bad IP. Shut down the machine without unregistering it. Plug in a cheap Linksys router, or some similar box, connect the PC to the router and rerun the DHCP registration. This should register the MAC of the router and give it a different IP. Of course now, the PC will be behind a NAT firewall, but I wouldn't think that should present a problem in most scenarios. Al Puzzuoli Michigan State University Information Technologist http://www.rcpd.msu.edu Resource Center for Persons with Disabilities 120 Bessey Hall East Lansing, MI 48824-1033 517-884-1915