Restarting the network interface using command lines in Linux is a straight-forward procedure. While the GUI (Graphical User Interface) for Linus network configuration is more graphical and visually ...
Over the weekend I setup an Ubuntu 12.04 server VM. I edited /etc/network/interfaces so eth0 has a static IP address... going from memory here: netmask 255.255.255.0 ...
Long ago, you could setup a Linux box and edit the /etc/resolv.conf file knowing the changes would stick. That made it incredibly simple to manage what DNS servers would be used by the machine.