We have couple Cisco 877 ADSL routers in some remote offices. To verify the ADSL line works properly, we add the routers into our Nagios monitor list. SNR (Signal to Noise Ratio) and Attenucation are two key measurements that tell you the performance of the ADSL line: SNR reflects the signal strength to the level … Continue reading Nagios XI: Monitoring Cisco 877 ADSL Router →

I have been playing with Nagios XI since last week. Here are some tricks I have found so far: 1) The default root password is nagiosxi. The default root password for the Nagios XI VMware virtual appliance is nagiosxi, which can be found on the login screen. 2) ‘$’ is considered as an illegal character. … Continue reading Nagios XI: Some Tricks →

My company decided to use Nagios XI instead of Nagios Core. Nagios Core is open source and can be used for free. Nagios XI is not a free tool, which means you have to pay for the license. And the price is determined by the hosts/nodes you intend to monitor. The Nagios XI is actually … Continue reading Nagios XI: Introduction →

1) Install prerequisites.yum install -y net-snmp net-snmp-utils 2) Check to see whether ‘check_snmp’ and ‘check_mrtgtraf’ can be found under /usr/local/nagios/libexec/ folder. If not,  you need to reinstall the nagios-plugin.  (It can be found in my previous post on the Nagios Installation) 3) As the ‘check_mrtgtraf’ will retrieve the bandwidth utilization information from MRTG log, the … Continue reading Nagios: Monitoring Router/Switch →