6 Essential Open‑Source Network Monitoring Tools Every Ops Engineer Should Know

Network monitoring is a vital practice for ensuring the security and smooth operation of network systems and data, helping operations staff detect and address issues promptly.

1. Zabbix

Zabbix is an open‑source, mature, enterprise‑grade network monitoring solution. It can monitor a wide range of network parameters, safeguard server systems, and offers flexible notification mechanisms that enable administrators to quickly locate and resolve problems.

2. Prometheus

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

3. Cacti

Cacti is a PHP‑based network traffic monitoring and graphing tool built on MySQL, SNMP, and RRDTool. It uses SNMP (via Net‑SNMP’s snmpget and snmpwalk commands) to collect data from remote devices, then visualizes performance trends with RRDTool‑generated graphs.

4. Grafana

Grafana is an open‑source data‑visualization and monitoring platform that lets users create dashboards and charts to monitor, analyze, and visualize data from various sources in real time.

5. OpenNMS

OpenNMS is an open‑source, extensible, enterprise‑grade network monitoring and management platform. It provides features such as automatic discovery, event and notification handling, performance measurement, and service availability testing.

6. Nagios

Nagios is a free, open‑source network monitoring tool capable of monitoring Windows, Linux, Unix hosts, network devices such as switches and routers, and peripherals like printers. It sends email or SMS alerts when a service or system status changes and notifies when the status returns to normal.