Connected to Wifi but no internet

I have a recurring problem that I've been unable to find an answer for. My computer will be connected to the wifi with full signal, but it will be unable to connect to any websites. Symptoms and attempted fixes:
It has an IP address, but all ping requests timeout.
The only "solution" is to turn the wifi off and then back on. This works, but usually only temporarily. The connection usually goes out again after several minutes.
There are no problems when the computer is connect to the router using ethernet.
Only macbook pro's seem to have the issue on the network, other connected devices do not.
It has occurred on other routers as well.
I found vague answers about it being an internal firewall issue, and deleting some random plists. No luck. Any thoughts?
Thanks

Power off the router. Unplug it from the wall. Wait for few minutes.
Connect the router back to to the wall.
Power the router back on. Wait until all lights are lit properly. It will take a while.
Restart the computer.
Start up in Safe Mode.
http://support.apple.com/kb/HT1455

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Did the iOS device connect before?
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