How do I get a new DHCP address?

I work in television, and we travel to a new location each week. Our Network is run through NomadixAG3000, and, anyone with a PC doesnt seem to have any issues logging on to our network. There seems to be new Mac users every other week, and the problems are escalating... For some reason, Macs seem to hold a DHCP address, I don't need to Renew my DHCP lease, I need a NEW DHCP lease. I just found a new error message, telling me the address is in use. I can't seem to get the computer to search for a different address. When I log on in MY work area, it is to a wireless access point/router , with encryption, so there doesnt seem to be any competition for these addresses. I work closely with our IT guys, but not in IT, and while I am completely ignorant as to System Administration, as a Mac User out here, I'd like to know the hows and whys to the problem.
UPDATE: Every MAC, not just mine, seems to be trying to access the network to the SAME address, and once it's taken, we get an error message saying the 10.10.23.97 address is taken. I'm pretty sure the problem is with the Network System Admin settings. I log on without any issues on many other Nomadix based systems in hotels/coffeeshops, etc. Anyone see a clue here?

BklynMoonshiner,
I think you are on the right track with your suspicion that this is a router/hosting problem, not a Mac (OS X) problem. What is interesting is that all OS X machines are either attempting to acquire- or are being offered- the same IP address. This may be the clue you need to figure this out.
Off the top of my head, the only thing that comes to mind, the only thing that would be common to the OS X machines but not necessarily a PC, is that they are also attempting to configure IPv6. Your infrastructure may not be capable of IPv6, or it may not be configured to support it. Since all of the OS X clients would be attempting to configure it, they might all end up asking for or getting the same IP address. I think the latter is more likely; not able to process the IPv6 requests, the router/host simply defaults to a single IP address, instead of granting addresses dynamically.
I'm just guessing, and I'm no IT guru by a long shot. The networking stack seems like a bad nightmare to me. However, I think it is worth a try to disable IPv6 and see if it changes anything. Open System Preferences>Network. Open the padlock, if necessary, then click the "Advanced..." button with your Airport connection selected. Switch to the "TCP/IP" tab, and use the pull-down menu to turn IPv6 off. Save your settings, then try reconnecting to the network. Do this with at least 2 or 3 OS X clients, and test them on the same access point.
Scott

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