Just the other day I made changes to my network: WRT150N (DD-WRT): Router, 802.11n AP, DHCP server WRT54G (tomato): 802.11g AP Linux server: DNS server to... WRT150N (DD-WRT): 802.11bgn AP WRT54G (tomato): Router, DHCP/DNS (dnsmasq) server .... ever since then my MacBook won't auto connect to the network after reboot or wake up from sleep. When it connects, it will say in Network Settings that its connected but didn't get an IP address then disconnects a few seconds later. If I manually select the SSID in the menubar, it all works fine until I close the lid/sleep. I have tried removing the old/new SSID settings, even from the Keychain. Also setup a new location and no improvement. I do have an AppleTV hooked up the same way before and now as my MB and there are no problems with that at all. Setting manual IP info doesn't seem to make any difference. Nor does changing the MAC address of the WLAN interface. ... I did try the other router (WRT54G) that isn't utilizing its WIFI (but did before, just not regularly with the MacBook) and I get the same thing there. Any ideas?