Wi-Fi Static Ip on a Macbook-Pro I have a Macbook Pro Mid 2012 with Mountain Lion. The goal is to have an ip address that never changes, even after reboot or changing to a different wireless network.

I followed the steps from this link - http://www.macinstruct.com/node/550 and it works for 'ethernet' connections. It tells you to go to network advanced settings and to use  "Using DHCP with Manual Address" under the TCP/IP tab. 

It does not work for 'Wi-Fi' connections. Does anybody know how to make it work for 'Wi-Fi'?
Make sure that you have the correct gateway and netmask, and after setting your IP address information you click OK, then click Apply on the original network screen.