network-admin
  network-admin is part of the GNOME system tools, a set of tools to 
  easily access and manage system configuration.

  invoke: /usr/bin/network-admin

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( https://help.ubuntu.com/community/NetworkAdmin )
In Ubuntu, the graphical configuration tool to configure network interfaces is 
called network-admin. This is an alternative to using nm-applet (GNOME front 
end for NetworkManager).

Warning /!\ nm-applet does not use the standard NetworkAdmin file 
/etc/network/interfaces to store the Wireless Network settings, so you will not 
be able to use ifup and ifdown commands to start/stop network adapters. This 
can make it more difficult to diagnose connection problems.

In Ubuntu 8.10 (Intrepid Ibex) and newer, install the package gnome-network-admin 
through Synaptic, or through the terminal with:

   sudo apt-get install gnome-network-admin