user modifications, but using the GUI is still preferable, because it
protects you from errors.
+WARNING: It's discourage to use the Debian traditional tools `ifup` and `ifdown`
+if unsure, as they have some pitfalls like interupting all guest traffic on
+`ifdown vmbrX` but not reconnecting those guest again when doing `ifup` on the
+same bridge later.
+
Apply Network Changes
~~~~~~~~~~~~~~~~~~~~~