TCP/IP Settings For MacOS8 +:

1) Select Apple Menu > Control Panel > TCP/IP
2) From the Connect Via: drop-down box, choose "Using DHCP Server"
3) All other fields should be left empty.
4) Choose File > Close from the top menu.

5) Select SAVE from the configuration dialog box
6) For DHCP configuration to take affect, you will need to reboot your computer.

TCP/IP Settings For Mac OSX:

1) Select Apple Menu > System Preferences > Network
2) Select the TCP/IP Tab
3) Choose "Built-In-Ethernet" from the Configure: box located at the top.
4) From the second Configure: box at the bottom, choose "Using DHCP"
5) Click the Save button.
6) For DHCP configuration to take affect, you will need to reboot your computer.