I'm having similar issues. Plugging in direct to the router is fine. But trying wireless,
ALL Apple devices fail to work. I can sometimes
start to get going and pull up a web page, then it dies. All network settings
look fine (and I do a TON of networking - I know my DHCP and TCP/IP settings inside out -- I've even written networking apps for iPhone, so I'm not a noob.
grin).
I'll also note that a Windows laptop connects wireless just fine. But 2 different MacBooks (one a white, one a Pro), iphone and iPad all refuse to connect wirelessly. And again, we DO get assigned DHCP stuff (get an IP etc.) and it
starts to want to work, then dies.