Wireless Network Settings for Mac OS X
1. From the Dock or the Apple Menu, click on the System Preferences icon.
2. Double click on the Network icon.
3. Choose Built-in Ethernet from the Show menu, and click on the TCP/IP tab.
4. Select Using DHCP from the Configure IPv4 menu.
5. Go to the System Preferences menu in the top left, and choose Quit System Preferences.
If you have any problems, come back to this window and click on Configure IPv6 and turn that off.