Instalar NTOP

Referencia: http://tuxroot.wordpress.com/2008/01/15/ntop-otra-herramienta-para-monitorizar-la-red/
http://www.linuxparatodos.net/portal/article.php?story=ntop
http://rolfsa.blogspot.com/2009/04/ntop-on-centos-53-for-netflow.html