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On Thu, Feb 26, 2009 at 05:00:52PM -0500, David McFarlane wrote: > ... > How do we force DHCP to assign a new *dynamic* IP address? If > you happen to know that the DHCP protocol forbids this (as another > here has already posted), then please just say that and that will end > the discussion. Dave, It isn't the DHCP protocol that is the issue. It's a question of how the DHCP server could determine that there is a squatter. Since we run a layer 3 (routed) network between the clients and the DHCP server, the only useful tool available to the server is to try a ping, which it does. If the DHCP server gets an unexpected ICMP response, it will temporarily skip the IP address in question, and try another. But these days, most systems block ICMP, so that doesn't help as much as it could. That leads us back to a manual process, which is where contacting the ATS Help Desk is needed. They should ask for this, but be sure to give them the IP address in question, along with the MAC address of the computer which is having trouble. Doug -- Doug Nelson, Network Architect | [log in to unmask] Academic Technology Services | Ph: (517) 353-2980 Michigan State University | http://www.msu.edu/~nelson/