Top 6 Free Open-Source Network Monitoring Tools Every Ops Engineer Should Know

Network monitoring is a crucial means to ensure network system and data security, helping operations staff promptly detect and address issues to keep networks running smoothly.

This article briefly introduces six free open-source network monitoring tools, providing documentation for operations engineers to bookmark.

1. Zabbix

Zabbix is an open-source, mature, enterprise‑grade network monitoring solution. It can monitor various network parameters to ensure secure operation of servers, and provides flexible notification mechanisms for administrators to quickly locate and resolve problems.

2. Prometheus

Prometheus is an open-source, scalable, enterprise‑level monitoring and alerting tool. Its main features are a multidimensional data model and the flexible query language PromQL, making it well‑suited for dynamic cloud environments.

3. Cacti

Cacti is a PHP/MySQL/SNMP‑based network traffic monitoring and graphing tool. It uses SNMP (via Net‑SNMP's snmpget and snmpwalk) to collect data from remote devices, stores it with RRDTool, and displays performance trends through PHP‑generated graphs.

4. Grafana

Grafana is an open-source data visualization and monitoring platform that creates dashboards and charts for real‑time monitoring, analysis, and visualization of various data sources.

5. OpenNMS

OpenNMS is an open-source, extensible, enterprise‑grade network monitoring and management platform offering features such as auto‑discovery, event and notification management, performance measurement, and service availability testing.

6. Nagios

Nagios is a free open-source network monitoring tool that effectively monitors hosts (Windows, Linux, Unix) and network devices (switches, routers, printers). It sends email or SMS alerts when services fail and notifies when they recover.

Mastering monitoring tools is essential for operations. The six tool documents are packaged; scan the QR code and note “Monitoring Collection” to receive them for free.