The best way to discover the topology of a network is to run a topology discovery using NMAP.


  • # nmap -sP  Now known as #nmap -sn  This option tells Nmap not to do a port scan after host discovery, and only print out the available hosts that responded to the host discovery probes. This is often known as a ping scan”.
  • # nmap -sL –  This scan uses DNS to flesh out a network and doesn’t send any packets to the system.