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Recently i found that there is problem with MacBook Air AirPort. My MacBook Air able to connect to the WIFI through our AirPort Extreme but it fail to get the DNS from the AirPort Extreme.
Yesterday i did troubleshoot this issue, i try to reset the Mac OS X network configuration to factory default. The problem was solved.
In order to reset the network settings back to factory default. First, we have to remove/rename a preference file and restart the machine. On boot the system will recreate the preference file from its default sources.
To do this, I renamed the file:
/Library/Preferences/SystemConfiguration/preferences.plist/Library/Preferences/SystemConfiguration/preferences.plist.bak
After that, just delete the preferences.plist file and restart your machines.
I hope this post will help you solve your problem. 
Tags: how to reset network settings on a macbook, OS X :: Reset Network Settings To Default, reset network setting, reset the network settings back to factory default
Thanks ! but how do we actually have to do it? just type it in the terminal ?
i have a macbook pro running 10.6.7. i connect to the internet via a usb device. i could share the internet connection with my iphone pretty easily before. But sometime in between i messed with the network settings & now the iphone detects to the wifi connection provided by the mac but wont connec to the internet. The phone does connect to other wifi avlbl. Thought resetting the network setting should help. Can you guide plz ?
Thanks !