The NM-connections editor is where the user can edit and create the various connection types. To invoke the nm-connections editor you need to right-click on the nm-applet and then click on Edit Connections. Clicking on that option would result in a tabbed window called network connections having different ways to connect to the network/Internet.Read answer to: "Ubuntu: SIOCADDRT: File exists Error and Solution"
Ubuntu Linux editing eth0 network connection
by Nix Craft on January 3, 2011· LAST UPDATED January 3, 2011