Self-Assigned IP with Leopard

My MacBook Pro running Leopard (10.5.1) with Airport Extreme can't get an IP address from our Linksys wireless-n router (WRT300N) at work -- all I get is a self-assigned IP. At home I have a Linksys wireless-g router that works fine. Tiger did not have this problem.
Renewing the DHCP lease doesn't fix it. Manual DHCP configuration doesn't seem to work (even with our DNS addresses manually entered). Leopard was a clean install, not an update, so there's only one airport kernal extension. I tried booting into safe mode and restarting the computer.
If I wait then the Mac will eventually get an IP, but it sometimes takes up to an hour.
Does anybody have a solution to this problem that actually works?

I just experienced this on one out of four machines. My experience was largely similar to those that others have been having with the machine not receiving a DHCP address. What made this problem all the more frustrating was the fact that I could SEE the DHCP request and reply in my Mac OS X server logs so I KNEW it should be working. However, after trying all of the solutions that I could find on the internet, I found a temporary solution. Instead of using DHCP, I simply switched to BootP and everything worked as it should. Of course, this might not work in every network environment, but it might work for some, so I thought I would post it. HTH!

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