DHCP configuration options

Can anyone tell me how to change the DHCP configuration options - the same information found in dhclient.conf in linux/unix - under OSX? A corporate client of mine provides wireless internet at all their facilities, but no one with a Mac has ever been able to connect. The wireless connection comes up and is stable, but the Mac never receives an IP address. I am fairly certain they forward DHCP requests to a centralized server that handles multiple LAN segments. I suspect something in the format of the DHCP packet, perhaps one of the many options, is causing their router to drop the Mac's DHCP request packet. I have captured DHCP requests from OSX and Win2K using Ethereal, so I have some idea what options to try changing, but I need to know how to go about it. I've tried adding a dhclient.conf file, but OSX seems to ignore this.
Needless to say, this is not a simple question and I realize I'll be fiddling at low levels. However, I've tried everything there is to try with the control panel, command lines, etc. I generally have no problems getting WiFi to work across Mac and windoze whether at home, in hotel rooms, or at corporate locations, but this one really has me stumped. Any help is appreciated.

How are you connecting to the wireless network? Is it a closed network with security, or an open network? There are a lot of different protocols in play with a wireless connection, particularly with Cisco equipment. It's possible Macs don't support one of the protocols where Windows does. There may be extra security such as DHCP client IDs, or using DHCP reservations only. There could be MAC address security setup on the wireless APs.
I would ask one of your PC buddies help you find an unused address. Set that manually and see if everything works. If it does you know you have a DHCP problem. If it doesn't there's a problem with the wireless connection

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