Mac OS X 10.6: Using Ethernet to connect to a network or the Internet
If you use Ethernet to connect to a network or to a digital subscriber line (DSL) modem that connects to the Internet, you need to enter the settings you received from your network administrator or Internet service provider (ISP) into Network preferences.
If you’re connecting to an Ethernet network, make sure your computer is connected to the network Ethernet device (such as a hub or router) with an Ethernet cable.
If you’re connecting to a DSL modem, make sure it’s connected to your computer’s Ethernet port with an Ethernet cable, and connected to the phone wall jack with the cable that came with the modem. Turn the modem on and let it start up completely.
To enter Ethernet settings:
Choose Apple menu > System Preferences, and then click Network.
Choose Ethernet from the network connection services list.
Choose your ISP's recommended configuration method from the Configure menu.
Choose Using DHCP or Using BootP if you receive an IP address automatically from your service provider.
Choose Manually if you received a specific IP address from your service provider. Enter the IP address, subnet mask, and router address you received from your service provider.
Type the IP address of your ISP’s DNS server in the DNS Servers field. If your service provider gave you search domain addresses, enter them as well. These may not be needed if you configure your IP settings to use DHCP.
Click Apply to make the settings active for the Ethernet service.
Click Advanced if you were given additional settings from your service provider, such as IPv6, proxy server, or additional Ethernet settings. Use the links below for more information about entering advanced settings.