Telnet/VTY Configuration Node Configure parameters of the Telnet/VTY Interface, such as to which IP address it should bind/listen to. CTRL Configuration Node Configure parameters of the CTRL Interface, such as to which IP address it should bind/listen to. GGSN Instance Configuration Node Configure an Instance of a (virtual) GGSN APN Configuration Node Configure an Access Point Name (APN) inside a GGSN Instance