Viewing and Configuring Interface Configuration
To start configuring your network interface, click the KDE menu -> System Settings -> System Network Configuration". Alternately, you can click the network icon in your system tray.
If you highlight an interface and click the Configure button in the Devices tab, you will be prompted for the administrative password. A popup Configuration window then appears for you to adjust various settings. Figure X-XX provides an example of clicking on the Ethernet interface named "re0":