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

Network monitoring is a crucial method to ensure network system and data security, helping operations staff detect and address issues promptly for smooth network operation.

This article briefly introduces six free open-source network monitoring tools, recommended for ops engineers.

1. Zabbix

Zabbix is an open-source, mature, enterprise‑grade network monitoring solution that can monitor various network parameters, ensure server system security, and provides flexible notification mechanisms for rapid problem identification and resolution.

2. Prometheus

Prometheus is an open-source, scalable, enterprise‑level monitoring and alerting tool. Its multi‑dimensional data model and powerful query language PromQL make it well‑suited for dynamic cloud environments.

3. Cacti

Cacti is a PHP‑based network traffic monitoring and graphing tool built on MySQL, SNMP, and RRDTool. It collects data via SNMP (using snmpget and snmpwalk) and visualizes performance trends over time.

4. Grafana

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

5. OpenNMS

OpenNMS is an open-source, extensible, enterprise‑grade network monitoring and management platform offering automatic 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 Windows, Linux, Unix hosts, network devices, and printers, sending email or SMS alerts when anomalies occur and notifying when status returns to normal.

Mastering these monitoring tools is essential for operations engineers; the documentation for all six tools is packaged for free download.