Recently I have been having a lot of issues with my macbook pro and connecting to my home network, Airport on mac osx would seem to be connecting to find to the network, but the computer would never get an address from the dhcp server on the network, and manually setting the ip address would still result in no joy.

The network setup is WPA (AES CCMP + TKIP), multiple channels, and multiple access points to give full coverage.

The laptop has the latest firmware including the AirPort Extreme 802.11n* Enabler for Mac.

Having searched for solutions none of which really solved my problems.
Wifi (airport) solutions
Airport macbook pro problems
Apple support – Discussions

There seems to be some issues with the Macbook pro airport and using WPA with AES CCMP encryption. My solution for now is to configure the access points on the network to use TKIP encryption.