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 1. Net Admin
 2. The Best Open-Source Network Monitoring Tools in 2024

We are funded by our readers and may receive a commission when you buy using
links on our site.


THE BEST OPEN-SOURCE NETWORK MONITORING TOOLS IN 2024

Open-source network monitoring tools provide better visibility and customization
options to smaller and startup organizations. We deep-dive and review a handful
of projects that stand out.
Writer: John Cirelly

Updated: April 12, 2024


We’ve already covered the best network monitoring tools and software, but we’ll
be showing the open-source community some love in the article. Then, we’ll touch
on why you might want to choose an open-source tool and explore the best
open-source network monitoring tools on the market today.

Here is our list of the best open-source network monitoring tools:

 1. Zabbix EDITOR’S CHOICE The best overall balance between open-source
    flexibility, support, and out-of-the-box ease of use.
 2. Icinga Great API and documentation.
 3. Prometheus Uses a powerful query language to generate insights and display
    data.
 4. Nagios Offers both paid and free open source networking monitoring tools.
 5. Cacti Highly customizable, great for operations leveraging big data.


ARE OPEN-SOURCE TOOLS BETTER?

Open source tools provide better visibility and customization options to
organizations that value flexibility over a “done for you” experience. When
tools are open source, any developer can view and modify the code to their
liking. This transparency creates plugins, community-driven features, and
continuous testing of the code’s stability and security.

Frequently, open-source means the product is free. This can provide
enterprise-level tools and features to smaller businesses and non-profit
organizations that otherwise couldn’t afford access. But calling open source
tools free is misleading.

Many times open source tools have hidden costs down the line that you should be
aware of. The more an organization relies on open-source technology, the more
expensive it can support it. For example, if your open source network monitoring
tool suddenly breaks, there’s no vendor support line to call for help.

Instead, you’ll need to ensure staff are well trained on the product and can
resolve the issue. This can take a lot of time and, subsequently, human
resources. What’s even more costly is hiring an expert consultant to fix the
problem, that is, if experts on that product even exist.



With open-source software, you don’t have to worry about a vendor going out of
business or being acquired by another company that wants to kill the product.
Many times I’ve seen great products become unusable because a new owner
mismanaged them. With open-source, you’re in control. Companies often rely on
the product’s community for support, bug fixes, and features, but this can be
dangerous.

Communities can slowly dissolve over time, leaving the product in an orphaned
state. If this occurs, you’ll need to make sure your staff is experienced enough
to resolve issues without the help of others.

There are pros and cons to running an open-source tool. Understanding the risks
and rewards of doing so will help you know if it’s the right choice for your
organization.

OUR METHODOLOGY FOR SELECTING AN OPEN-SOURCE NETWORKING MONITORING TOOL

We reviewed the market for open-source networking monitoring tools and analyzed
the options based on the following criteria:

 * A large and active user base or community
 * Detailed knowledge base articles, help documents, or tutorials
 * Integration support for other tools you may need, such as infrastructure
   monitoring
 * Are there any known vulnerabilities? If so, why haven’t they been patched
 * Organizations similar to yours that are using the same software



With that said, we’ve tested out some open-source network monitoring tools and
created a list of our favorites.


THE BEST OPEN-SOURCE NETWORK MONITORING TOOLS


1. ZABBIX



Zabbix is a powerful and popular open-source networking monitoring tool. It uses
simple agents to collect SNMP and IPMI data to provide insights into different
networks, applications, hosts, and cloud-based services. In addition, the
platform uses a simple auto-discovery feature to detect new devices and changes
on currently monitored assets.

When we tested Zabbix we found the following key features.

Key Features:

 * Auto-Discovery: Features automatic discovery of devices and services on the
   network, simplifying the setup and configuration process.
 * Flexible Monitoring Options: Supports various monitoring methods, including
   agent-based, agentless, SNMP, IPMI, and JMX, providing flexibility in
   monitoring diverse environments.
 * Performance Monitoring: Monitors performance metrics such as CPU usage,
   memory utilization, network traffic, and disk space, enabling proactive
   performance management and troubleshooting.
 * Alerting and Notification: Offers customizable alerting and notification
   mechanisms to notify users of critical issues via email, SMS, or other
   communication channels.
 * Dashboards and Reporting: Provides customizable dashboards and reporting
   capabilities to visualize performance data, trends, and insights for informed
   decision-making.

WHY DO WE RECOMMEND IT?

Zabbix is a free system monitor that can supervise networks, servers, and
applications. This tool has a sophisticated interface and provides automated
network monitoring with alerts for performance dips and resource shortages. The
network monitoring module provides device monitoring and traffic analysis. This
package includes device discovery and network inventory and map creation.

There are numerous preconfigured templates to choose from that support major
vendor solutions like Cisco, Dell, Intel, and Netgear, to name a few. For more
obscure integrations, you can search the Zabbix community for assistance.

The community is strong with a Facebook group and Telegram chat supported in
over nine different languages. There’s also the Zabbix support system, which
acts as a live bug tracker. This system helps bring critical security
vulnerabilities to the developers’ attention, ensuring the product is
consistently reliable.

Visually the default interface is pretty solid but allows you to customize the
view of your environment through widget-based apps. There are numerous options
for remediation, alerts, and escalation that help highlight precisely what needs
to be done to resolve an issue.

WHO IS IT RECOMMENDED FOR?

Zabbix is suitable for businesses of all sizes but it will appeal more to small
businesses. The server monitoring system is able to track the performance of
cloud platforms and the network monitoring can extend out to those platforms
over the internet. The package is very easy to use and sets itself up through an
autodiscovery routine.

During our testing, we identified the following pros and cons related to Zabbix.


PROS:

 * Cost-Effective: Being open source, Zabbix is cost-effective compared to some
   commercial monitoring solutions, making it an attractive option for
   organizations with budget constraints.
 * Active Community: Benefits from a large and active community of users,
   forums, and resources for support, knowledge sharing, and collaboration.
 * Agent-Based and Agentless Monitoring: Supports both agent-based and agentless
   monitoring, allowing users to choose the most suitable method for their
   environment.
 * Extensive Monitoring Capabilities: Offers comprehensive monitoring for
   diverse IT infrastructure components, providing visibility into system health
   and performance.


CONS:

 * No SaaS Version: Lacks a Software-as-a-Service (SaaS) version, which may
   limit deployment options for users preferring cloud-based solutions.
 * Complexity: Setting up and configuring Zabbix can be complex, particularly
   for large-scale deployments with a high volume of monitored devices and
   services, requiring adequate planning and expertise.

Overall, Zabbix is incredibly flexible with its open-source networking
monitoring options and is supported by a large dedicated community that have
continuously improved the platform over the years.


EDITOR'S CHOICE

Zabbix is our top pick for an open source network monitoring tool because this
system is completely free to use but has all of the facilities that the top paid
network monitoring packages offer. This system can be run on your own server or
on a cloud platform account. You can use it to monitor multiple sites remotely,
checking constantly on the internet links between them as well as network paths.
The service can monitor virtualized and cloud systems as well as physical
networks.

Download: Download this tool for free

Official Site: https://www.zabbix.com/download

OS: Linux, container, or cloud


2. ICINGA



Icinga is an open-source platform that supports multiple tools, including a
network monitoring solution. The tools are designed to seamlessly integrate,
allowing organizations to gain complete visibility into their infrastructure,
network, and metrics through the Icinga stack.

When we tested Icinga we found the following key features.

Key Features:

 * Monitoring Capabilities: Monitors various network devices (servers, routers,
   switches, etc.) and services (HTTP, DNS, email, etc.) for performance,
   availability, and errors.
 * Plugin Architecture: Supports a vast library of plugins for monitoring
   diverse services, applications, and operating systems. (This allows for
   extensive customization).
 * Alerting System: Offers flexible alerting systems that can notify
   administrators through email, SMS, or other notification channels when issues
   arise.
 * Scalability: Designed to handle large and complex network infrastructures
   effectively.
 * Reporting: Provides reporting functionalities to generate reports on network
   health and performance metrics over time.
 * Customization: Offers extensive configuration options for tailoring
   monitoring behavior to specific needs.
 * API Access: Provides an API for programmatic interaction and integration with
   other tools.

WHY DO WE RECOMMEND IT?

Icinga is a fork of Nagios Core, which is detailed below. Since the Nagios team
separated its traffic analysis functions out into a separate paid tool, Icinga
provides more network monitoring features. This tool is completely free to use
and can be extended by Nagios plug-ins.

The platform continues to receive updates and just recently supports several
forms of agentless monitoring solutions. Icinga has proven itself a reliable
open-source network monitoring tool and has been used by big brands such as
Adobe, T-Mobile, and Siemens.

The platform offers network monitoring for both on-premises infrastructure as
well as cloud-based solutions and containerized applications. While the cloud
monitoring modules are separate from the infrastructure monitoring features,
they can be accessed through the same platform.

While other platforms are hyper-focused on a single element of monitoring,
Icinga works to provide complete infrastructure visibility across the network,
making it easier to identify the source of a problem. The alert system is well
built, and while it is customizable, it does offer a good starting point for
anyone to get actionable insights right away.

Community support for Icinga is strong, offering support through multiple
channels such as GitHub, web forums, Meetup, and even in-person events. Icinga
is a robust open-source networking monitoring tool that makes itself accessible
to smaller businesses while still being reliable enough to be used in an
enterprise environment.

WHO IS IT RECOMMENDED FOR?

The Icinga system has a better user interface than Nagios, making it easier to
use. The software runs on Linux or Windows and it provides full network, server,
and application monitoring. It can also extend its monitoring services out to
cloud resources. This package is suitable for small and mid-sized businesses.

During our testing, we identified the following pros and cons related to Icinga.


PROS:

 * Free and Open-Source: Being free and open-source makes it a cost-effective
   solution for network monitoring.
 * Flexible and Scalable: The plugin architecture and configuration options
   allow for adapting Icinga to diverse monitoring needs and network sizes.
 * Community Support: Benefits from a large and active community providing
   support and resources.
 * Built-in Visual Reporting: Icinga supports built-in visual reporting,
   providing insights and data visualization for monitoring metrics.
 * Cross-Platform Support: Icinga can run on both Linux and Windows operating
   systems, offering flexibility in deployment.


CONS:

 * Steeper Learning Curve: Setting up and configuring Icinga effectively might
   require some technical expertise due to its flexibility and customization
   options.
 * Maintenance Overhead: Managing a self-hosted solution like Icinga requires
   ongoing maintenance and updates.


3. PROMETHEUS



The Prometheus platform offers network monitoring and highly detailed
visualization that are great for creating reports or displaying live metrics
across your network operation center. The platform uses a PromQL to pull data
and create visuals, making it highly flexible and favorable to those with query
language experience.

When we tested Prometheus we found the following key features.

Key Features:

 * Time-Series Data Collection: Focuses on gathering time-series data (metrics)
   about various network components and services at regular intervals.
 * Pull-Based Model: Relies on monitored targets (servers, applications) to
   expose metrics through HTTP endpoints that Prometheus scrapes periodically.
 * PromQL Query Language: Provides a powerful query language (PromQL) for
   querying, filtering, and analyzing collected metrics data for insights into
   network health.
 * Alerting System: Offers an alerting system that can trigger notifications
   based on defined thresholds or anomalies detected in the collected metrics.
 * Multi-Dimensional Data: Metrics can be associated with labels (e.g., server
   name, service type) enabling detailed analysis based on specific criteria.
 * Integration with Grafana Frontend: Prometheus works well with the Grafana
   frontend, providing a powerful combination for monitoring and visualization.

WHY DO WE RECOMMEND IT?

Prometheus is an analysis package for any type of time-series data. The tool is
very flexible but that also means that you need to do a lot of work to get it
set up as a network monitor. Prometheus has its own Web user interface but many
users opt to pair it with Grafana.

Visually, Prometheus is one of my favorite platforms in terms of looks and
style. The interface is sleek and allows for numerous customization options with
pre-configured views for those who don’t want to tinker. In addition, you can
use Grafana to leverage their collection of shared dashboards if you don’t want
to build your own.

In addition to community support, the platform also promotes several paid
training and commercial support options provided by third parties. I like this
option as it gives organizations a platform to start training their internal
staff in a more structured way than knowledge base articles can provide.

Prometheus is likely not a good fit for smaller organizations due to its
complexity and specialization around big data. However, enterprise companies who
can invest in talented staff to master the platform can easily reap the benefits
Prometheus brings to the open-source monitoring ecosystem.

WHO IS IT RECOMMENDED FOR?

Prometheus is used by large businesses. It is suitable for the creation of
custom data analysis systems and its alerting mechanism means that it is
particularly good for monitoring applications, such as traffic monitoring. You
need to master the proprietary query language to get the best out of this tool.

During our testing, we identified the following pros and cons related to
Prometheus.


PROS:

 * Simple and Scalable: The pull-based model and focus on time-series data make
   Prometheus lightweight and scalable for large deployments.
 * Efficient Data Collection: Reduces overhead on monitored systems compared to
   push-based monitoring models.
 * Open Source and Active Community: Benefits from a large and active community
   fostering development and support.
 * Beautiful Data Display: Prometheus can display data beautifully and
   integrates seamlessly with platforms like Grafana, enhancing data
   visualization.


CONS:

 * Complex Configuration: Configuring Prometheus for monitoring may involve some
   complexity, especially for defining scrape targets, alerting rules, and
   service discovery mechanisms, which may require some learning curve.
 * Limited Long-Term Storage: While Prometheus is optimized for real-time
   monitoring and alerting, it may not be suitable for long-term storage and
   analysis of historical metrics data.


4. NAGIOS CORE



Nagios provides a suite of open-source tools that includes networking,
infrastructure, and application monitoring. While the platform is open source,
the only free version available is Nagios Core. Products like Nagios XI provide
enterprise-level features, support, and more pre-made dashboards and alerts.

When we tested Nagios we found the following key features.

Key Features:

 * Flexible Monitoring: Allows users to monitor a wide range of network services
   and resources including servers, switches, routers, applications, and more,
   through customizable plugins.
 * Alerting and Notification: Provides flexible alerting and notification
   mechanisms, allowing users to define thresholds, escalation policies, and
   notification methods.
 * Web Interface: Includes a web-based interface for configuration, monitoring,
   and reporting, providing a centralized dashboard for managing monitoring
   checks, viewing status information, and generating reports.
 * Plugin Architecture: Utilizes a plugin architecture, allowing users to extend
   its functionality by developing custom monitoring plugins or leveraging a
   vast library of existing plugins.
 * Scalability: Nagios Core is scalable and can monitor small to large-scale
   network infrastructures, with multiple monitoring servers and centralized
   management.

WHY DO WE RECOMMEND IT?

Nagios Core is a highly respected free open-source system monitoring package.
The tool provides network device monitoring and it is able to discover all
devices connected to a network. With this function, the tool compiles a network
inventory and a topology map can be generated with that information.

Additional features such as graphing and reporting are all available through a
plugin package. There are 50 core plugins in total which can all be downloaded
at once. For additional integrations and features, users can use the Nagios
Exchange to find community created add-ins.

In addition, the platform has an active support forum, as well as paid options
for support. While the paid support options are pretty expensive, they are
likely cheaper than what it would cost to hire a consultant if things took a
turn for the worst. Currently, phone support prices start at $1995 for a “5 call
pack”, so make sure you’ve used all your free support resources first.

For new customers, Nagios does offer what is called “Nagios Quickstarts.” These
are shorter free support sessions designed for prospective customers or new
users to help customize deployments and fix any roadblocks they’re experiencing.
More organizations should offer this approach; it allows new users to get
onboarded and likely increases customer retention for Nagios.

WHO IS IT RECOMMENDED FOR?

Nagios’s great strength is that it can be extended by free plug-ins that are
available in Nagios Exchange. One problem with this system is that the free tool
doesn’t have any traffic analysis functions and there are no plug-ins for that
purpose. The software runs on Windows, Docker, or VMWare.

During our testing, we identified the following pros and cons related to Nagios.


PROS:

 * Free and Open Source: Nagios Core is free to use, making it accessible to a
   wide range of users and organizations.
 * Extensible with Plugins: It is highly extensible through plugins, allowing
   users to customize and enhance its functionality according to their specific
   monitoring needs.
 * Support Options: It offers multiple support options, including free
   onboarding assistance, which can be beneficial for users who are new to the
   tool.
 * Fast Alerts and Insights: Nagios Core provides fast alerts and insights,
   working in near real-time to notify users about potential issues or
   anomalies.


CONS:

 * Steep Learning Curve: Configuration requires editing text files, which can be
   challenging for beginners.
 * Limited User Interface: The web interface is basic compared to some
   competitors.
 * Dependency on Plugins: While Nagios Core is extensible with plugins, some
   users may prefer more native support for features rather than relying heavily
   on plugins for basic functionalities.


5. CACTI



Cacti is a highly customizable monitoring framework that offers networking
graphing and data visualization capabilities. Similar to Prometheus, the
platform is incredibly detailed and requires an experienced administrator at the
helm to utilize all of its features thoroughly. Cacti can monitor networks and
devices using multiple protocols, including SNMP, ICMP, and TCP/UDP availability
checking. In addition, the platform provides device and network discovery
automatically, making it a solid option for busy networks.

When we tested Cacti we found the following key features.

Key Features:

 * SNMP Monitoring: Cacti provides SNMP monitoring capabilities, allowing users
   to monitor and manage network devices efficiently.
 * Graphing Powerhouse: Utilizes RRDtool for powerful data storage and graph
   generation, allowing for detailed historical analysis.
 * Device Templates: Simplifies setup with pre-configured templates for various
   network devices using SNMP, ICMP, TCP, and UDP.
 * Data Source Versatility: Monitors a wide range of metrics, including
   availability, CPU load, disk space, errors, and more.

WHY DO WE RECOMMEND IT?

Cacti is a flexible data analysis tool that was created to provide network
monitoring. The system needs a lot of setting up and it allows for
customization. You can select templates and plug-ins for a library to make the
development process faster. This software runs on Windows, Linux, and Unix.



The platform has dozens of plugins, all built off the Cacti Framework, which
essentially extends the platform’s capabilities. These plugins are created by
the community as well as some of the lead developers of the platform.

Cacti is a great free option if you have someone on your team with the
experience to implement and manage it. Additionally, organizations that want to
take complete control over their network monitoring data and how it is
visualized will enjoy the freedom that Cacti offers.

WHO IS IT RECOMMENDED FOR?

The Cacti system is a good option for network managers that want to set up their
own network monitoring system. It is probably more suited to small businesses
that have a quirky network that standard monitoring tools don’t fully cover.
This tool is comparable to Prometheus and can be extended by those with
technical skills.

During our testing, we identified the following pros and cons related to Cacti.


PROS:

 * High Customizability: One of Cacti’s strengths is its high level of
   customizability, offering users the freedom to configure and design
   monitoring solutions to meet their unique monitoring needs.
 * Community Support: Cacti has a strong community of users and developers who
   provide support, share knowledge, and contribute to the platform’s
   development.
 * Detailed Graphing and Visualization: Cacti provides detailed graphing and
   data visualization methods, which help users gain insights into network
   performance and trends.


CONS:

 * Focus on Graphing: Primarily a data visualization tool, alerting may require
   additional setup.
 * Steeper Learning Curve: Setting up and configuring Cacti requires some
   technical knowledge.
 * SNMP Dependency: Cacti relies heavily on SNMP for data collection, which may
   limit its ability to monitor devices and services that do not support SNMP or
   require additional monitoring protocols.


WHICH OPEN-SOURCE NETWORKING MONITORING TOOL IS RIGHT FOR YOU?

While there are quite a few tools to choose from, how do you know which one is
right for you? Our top choice is Zabbix due to its ease of use and simple
integrations into other platforms.

While some tools like Prometheus offer highly detailed graphing and query
analysis, these features sometimes create complexity that keeps businesses away.
Zabbix offers numerous out-of-the-box tools that allow you to get the platform
working for you without having to spend a day setting it up.


OPEN SOURCE NETWORK MONITORING FAQS


WHAT SHOULD I LOOK FOR IN NETWORK MONITORING TOOLS?



The primary element to look for in a network monitoring system is SNMP
capabilities. This service allows the monitor to automatically identify all
devices connected to the network and compile a network inventory. As SNMP cycles
constantly, the inventory is always up to date. This service will receive
notifications if any device experiences problems.




WHY IS NETWORK MONITORING NECESSARY?



Although network equipment from reputable suppliers can be expected to provide a
reliable service, there are always the possibilities of problems. Configuration
errors or capacity problems will cause networks to become overloaded and
unavailable, bringing down all of the applications that your users need. It is
important to be able to head off problems as soon as they arise.




WHICH PROTOCOL DO WE USE FOR NETWORK MONITORING?



The Simple Network Management Protocol (SNMP) is the standard facility used by
network monitoring systems. SNMP provides an agent, which all network equipment
manufacturers provide on their devices. All the system needs is an SNMP Manager,
which broadcasts requests for reports. The agents listen for this trigger and
then immediately send back a response, which is called a management information
base (MIB). The MIBs allow the monitor to identify every device on the network,
catalog their attributes, extract status reports, and record operational
metrics.






WHAT'S IN THIS ARTICLE?

 * Are open-source tools better?
 * The Best Open-source Network Monitoring Tools
 * Which open-source networking monitoring tool is right for you?
 * Open source network monitoring FAQs


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