Nagios is a host and service monitor designed to inform network operators about network problems. The monitoring daemon runs intermittent checks on hosts and services as specified in the configuration using external "plugins" which return status information to Nagios. When problems are encountered, the daemon can send notifications out to administrative contacts in a variety of different ways (email, instant message, SMS, etc.). Current status information, historical logs, and reports can all be accessed via a web browser.

Example of running implementations available in 6NET :

  NAGIOS software is used at NIIF/HUNGARNET for monitoring networking services. A separate
  NAGIOS station for monitoring IPv6 network service of HUNGARNET and 6NET has been setup.
  NIIF/HUNGARNET: http://6net.iif.hu/nagios/ (same user ‘6core’ from tools.6net.org)