Airport doesn't get an IP from wifi AP

I have a wifi network in my office, based on D-Link DWL-2100AP (latest firmware). It is setup to Static IP Pool mode, so that when client signs in he recieves from AP an IP-address assigned to clints MAC-address. The clients are set up to recieve network configuration via DHCP. So that every client have the same IP every time and everything could be easily monitored and billed.
The problem is with to Mac-clients, which are sign-in very slowly. The Airport says that it doesn't get DHCP info and self-assign the IP, so the www is not accessible. It gets the info after some time (5-30 minutes), but i didn't find any method to force the renewal of dhcp sign-in (i've tried airport on/off, computer reboot) except the reboot of AP, after that MBP get the IP in most cases.
So that, every morning i'm coming to my office and waiting half an hour or rebooting the AP to get to the internet. The same with other Mac client (13" Macbook - 2008). But nothing similar never happends with Windows-based clients in out network, as soon as portable opened - it is connected. But at the same time nothing similar happend to my MBPro at home - it connects to AP instantly.
I cannot stricktly identify whether the problen is with airport driver, or this exact access point, or exact bundle mac+DWL2100. I've tried to shorten lease time on AP, but it doesn't help.
Hope someone will advise any solution or, at least, any trick to get IP without rebooting AP.
Thanx in advance,
Art

I would lean toward a problem with your access point settings. I have a setup close to this with DHCP reserved reservations into a static pool and I have pretty instant IP distribution. So it isn't a problem with OS X. Have you tried creating a new dedicated network location in sys prefs? Don't think that should make a difference but it is how I connect.

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Airport doesn't get an IP from wifi AP

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