* http://www.pastelero.net/2006/08/26/usando-nagios-para-monitorizar-redes
  * http://www.nagios.org/
  * http://www.matthewjwhite.co.uk/blog/2010/02/09/monitoring-esxi-server-health-using-nagiosopsview/
  * http://www.nagiosexchange.org/cgi-bin/page.cgi?d=1
  * http://blyx.com/2008/11/21/nagios-vigila-yo-duermo/#more-141