Threshold Based Alerts

Threshold Based Alerting on NetFlow

A network bandwidth monitoring tool does no good to a network administrator, if he has to sit all day long watching and waiting for the event to occur. And it is close to impossible to keep an eye on all the network activities 24x7. What you need is a monitoring system that will alert you when your network is not on the right track, so that you can rectify them before it adversely affects your business.

NetFlow Analyzer generates alerts and notifies you, when the traffic utilization exceeds pre-defined threshold settings. It also helps you to create and manage your thresholds effectively with the help of alert profiles. You can configure the alert threshold values based on utilization, duration and frequency.

Utilization: Set limits for bandwidth utilization by the IP groups and other device groups.

Duration: Set time periods and generate alerts based on threshold violations during that time period.

Frequency: Set the number of times the utilization is allowed to exceed alert threshold before an alert is raised.

Set alert profiles for IP groups, Interfaces and Interface groups and define alerts based on the IN traffic, OUT Traffic or on Both. The Network Administrator is also alerted when the link goes down or when there are no flows for more than 15 minutes.

  • NetFlow Alert based on Threshold – ManageEngine NetFlow Analyze
  • NetFlow Alerting – Alert based threshold on NetFlow
 - ManageEngine NetFlow Analyzer


Network administrators cannot afford to miss alerts generated. For this reason NetFlow Analyzer provides the SNMP traps as alert notification system. You can set up an SNMP Trap notification to immediately notify any application or SNMP device, when an alert is triggered. The alerts generated by NetFlow Analyzer can also be forwarded as a trap message to any manager application. This in a way helps to consolidate all the network alerts in a single place in the manager application. For the convenience of network administrators, Alerts Profiles can be configured to send email notification to immediately notify, when the alert is triggered. The notifications can be sent along with a PDF attachments, to any number of email addresses specified.


A major software company located in the Silicon Valley used NetFlow Analyzer for network traffic monitoring.

At a given point of time, the number of DNS requests to the Internet surged at an alarming rate. This led to increased usage of the WAN link and the traffic percentage due to DNS requests increased the allowed threshold value set for that particular time of the day.

Incidentally, the IT network administrator was on an important overseas call. Since he had configured a threshold-based alert profile for DNS requests, he started receiving email alerts as soon as the threshold was exceeded. The IT administrator could read those emails through his iphone and could sense that something was going wrong as the number of DNS requests was simply alarming.

The IT administrator was aware that it is common for botnets to try to locate C&C servers by means of sending DNS requests. So, when the number of DNS requests surge rapidly, it could imply a network attack, which is on its way.

The IT administrator proactively took preventive measures that were needed to shield the network from being attacked which would have otherwise led to the company being in the headlines the next morning for the wrong reasons, affected critical business operations, broken the trust of clients and brought down the morale of the employees. In short, the entire company was saved from such undesirable after-effects of a network attack, thanks to that timely alert from ManageEngine NetFlow Analyzer.

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NetFlow Analyzer is a NetFlow, sFlow, JFLow (and more) collector and analyzing engine integrated together. NetFlow analyzer is a software (for windows and linux), does not require any hardware probes, which can be downloaded, used in your network environment and can be evaluated for 30 days. Go through the following useful links for better understanding of how NetFlow Analyzer can help you in understanding your network traffic and bandwidth utilization.

A proactive monitoring tool like Netflow Analyzer is a must for managing your network. With the recent change in role of the network and its increased importance, it has made managing the network critically important today.

- System Administrator

Network and Voice in the Services Industry


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