You can use very easily manner and very effective method to configure the ethernet card for driving the network,There are few steps to use this :
1- You need to type the command to open the dialog control in GUI mode :
2- After that you would see a dialog box which contains the GUI configuration of network devices.
$ system-config-network &
3- If you added a new Ethernet card then you need to choose the NEW button to add the new device and enter the required parameters to get it listed in the dialog.
4- After adding the new information for new card,you can activate the connected card with the help of buttons above in the dialog.