\begin{exe} {Using the \textbf{firewall} GUI}

   Each distribution has its own graphical interface for firewall
   administration.  On \textbf{Red Hat}-based systems you can
   run \textbf{firewall-config}, on \textbf{Ubuntu} it is called
   \textbf{gufw}, and on \textbf{openSUSE} you can find it
   as part of \textbf{yast} on the graphical menu system.

   We have concentrated on the command line approach simply
   because we want to be distribution-flexible.  However, for
   most relatively simple firewall configuration tasks, you can
   probably do them efficiently with less memorization from the
   GUI.

   Once you launch the firewall configuration GUI, do the previous
   exercise of adding \textbf{http} and \textbf{https} to the
   \textbf{public} zone, and verify that it has taken effect.

   Make sure you take the time to understand the graphical interface.

\end{exe}

