Nagios, one of the most popular tools for network monitoring, comes with its own share of problems as well.

One of the most prominent problems is that it is difficult to setup and maintain as all configurations should be done only through config files.

This can be cumbersome and time-consuming.

Here is our list of the best Nagios Alternatives:

1. SolarWinds Network Performance Monitor – FREE TRIAL This package for Windows Server competes with the network device monitoring service in the Nagios package. It provides network discovery and topology mapping as well as continuous monitoring. Get a 30-day free trial.
2. Paessler PRTG Network Monitor by Paessler – FREE TRIAL This bundle of monitoring systems tracks the performance of network devices and endpoints. It also monitors network traffic and provides application monitoring. Delivered as a SaaS platform or for installation on Windows Server. Start a 30-day free trial.
3. ManageEngine OpManager – FREE TRIAL This package of network and server monitors focuses on device resource availability and it also draws up a network map. Runs on Windows Server, Linux, AWS, and Azure. Start a 30-day free trial.
4. Site24x7 – FREE TRIAL This cloud platform offers full-stack monitoring through a series of modules. It also has configuration management and log management services. Start a 30-day free trial.
5. Zabbix This free software package provides network, server, and application monitors and it can be extended by templates. The software runs on Linux, VMs, cloud platforms, and Docker.
6. Icinga This free monitoring package for networks, endpoints, and applications is a fork of Nagios Core and has a front end that is as good as Nagios XI. This is as close as you can get to Nagios. Runs on Linux and AWS.
7. OpenNMS This network monitoring system (NMS) is available in free and paid versions. Both run on Linux.

Also, many IT administrators prefer to work with a Windows-style GUI instead of Linux and Unix commands, and this is a spot of bother in Nagios.

Other problems include its Auto-discovery of applications and services, complicated management, and more.

Due to these aspects, it is good to know your alternative options, especially if your IT admin team prefers it.

The Top Alternatives to Nagios

Though Nagios is one network monitoring tool, there are many other tools that could give Nagios a run for its money.

In this guide, we will look at some of the alternatives for Nagios but if you’re using Linux you might want to skip straight to the best Linux Monitoring Software.

1. SolarWinds Network Performance Monitor – FREE TRIAL

SolarWinds Network Performance Monitor is a powerful tool for network monitoring, as it helps to quickly detect, diagnose, and fix any network-related problems and outages.

Key Features

The important features of the SolarWinds Network Performance Monitor are listed below.

• Comes with Advanced Fault monitoring to quickly identify problems, understand their root cause, and fix them at the earliest.
• It can monitor the performance and availability of devices that are on-premises, in the cloud, or in a hybrid environment.
• You can drag and drop different performance metrics on a timeline, to identify the root cause at the earliest.
• It can provide intelligence-based alerts, as it takes into account several parameters such as topology, dependencies, and performance.
• Automatically discovers and maps devices in the network topology.
• Allows you to customize thresholds, according to peak and bandwidth usage.
• It monitors the performance and availability of the F5 BIG-IP family of products.
• It can monitor performance points for clients, wireless controllers, and autonomous access points.
• It can be installed and deployed within just an hour. The setup and use are well-documented and are fairly intuitive as well.
• You can automate capacity planning with this tool.
• Comes with web-based performance charts, views, and dashboards, so you can stay on top of your network’s performance from anywhere.
• Helps you identify if changes in end-user experience are caused by the network or application.
• Calculates baseline thresholds from historical performance data.
• It monitors many key metrics of hardware components such as temperature, fan speed, and power supply.
• Comes with more than 100 templates for reporting.
• You can create interactive charts and graphs to get a better understanding of your devices’ performance.

Why do we recommend it?

We recommend SolarWinds Network Performance Monitor for its robust and comprehensive set of features, ranging from advanced fault monitoring to customizable thresholds and web-based dashboards. The tool excels in real-time problem diagnosis and offers a quick setup, making it a highly effective solution for network monitoring.

System Requirements

You need the following system requirements to install SolarWinds Network Performance Manager.

• Database:
• .NET Framework: Version 4.5
• Operating system: Windows Server 2008 R2 SP1, Windows Server 2012 and Windows Server 2012 R2.
• Hard drive: 20GB free disk space
• Memory: 3GB
• CPU: Dual processor, 3.0 GHz
• Databases Supported:
  • SQL Server 2008, 2008 SP1, 2008 SP2, 2008 SP3 and 2008 SP4
  • SQL Server 2008, R2 SP1 and R2 SP2
  • SQL Server 2012, 2012 SP1, 2012 SP2 and 2012 SP3
  • SQL Server 2012, 2014 SP1
  • SQL Server 2016

Who is it recommended for?

SolarWinds Network Performance Monitor is ideal for network administrators, IT professionals, and businesses of all sizes that need in-depth network monitoring and quick problem resolution. It’s especially useful for those who manage complex, hybrid environments that include on-premises, cloud, and mixed infrastructures.

Start a 30-day free trial download!

SolarWinds Network Performance Monitor Start a 30-day FREE Trial

2. Paessler PRTG Network Monitor by Paessler – FREE TRIAL

Paessler PRTG Network Monitor by Paessler is a powerful solution that analyzes your entire infrastructure to give you a comprehensive idea of the weak points and the performance of devices in your network.

Key Features

Some of the salient features of PRTG Network Monitor are as follows.

• Provides aggregated statistics of many parameters such as status, availability, CPU load, and bandwidth to get a quick overview of the status of your network.
• Packet sniffing examines every single packet of data passing through your network to understand the possible problems that are increasing your bandwidth.
• Supports NetFlow, sFlow and jFlow
• Monitoring is done by sensors, that are arranged in a tree-like hierarchy to make navigation easy.
• It sends alarms and unusual alerts, based on the threshold values you have set. Red signifies alarms, yellow markings are warnings and orange is used to depict when there is an unusual reading from any device.
• It scans your network and auto-discovers sensors and devices. It even maps all of it for you.
• Comes with many templates for reports. A unique template is the “Top 10 Lists”, which it lists devices that fall into different categories such as best and worst performance, fastest and slowest performance, highest and lowest bandwidth use, highest and lowest CPU load, and more.
• Reports are comprehensive and can be used to analyze historic results over a specific day, month, or year.
• Reports can be run on-demand or they can be scheduled, and a report can be created for one or more sensors. This way, you have complete control over what you want to see and when you want it.
• Allows you to do a long-term comparison of the performance of your applications using remote probes.
• Its “maps” feature allows you to create web pages with monitoring information, in a customizable layout. This feature opens up countless possibilities to stay on top of your network.
• It can be scaled for networks of any size. Whether you want to use 100 or 10,000 sensors, this tool will work for you.
• Comes with 10 built-in technologies for sending alerts and they include email, push, play alarm audio files, trigger HTTP requests, and more.
• Comes with a full-featured AJAX-based web interface.
• Also, offers a Windows native Enterprise Console to see the performance of different devices.
• Has apps for both Android and iOS
• All user interfaces are SSL-based, and local and remote access can be done simultaneously.
• Allows failover tolerant monitoring, which means, one single failover is included in every PRTG license. Also, failover handling happens automatically and doesn’t require your intervention.
• It can monitor many networks spread across different locations, provided they are all a part of your organization.
• Remote probes can be used to distribute monitoring loads.
• You can export your data in many file formats such as PDF, XML, HTML, and CSV.
• Supports many languages such as English, German, Spanish, French, Dutch, Russian, Japanese and Simplified Chinese.

Why do we recommend it?

We recommend Paessler PRTG Network Monitor for its holistic approach to network monitoring, with features that provide aggregated statistics, packet sniffing, and customizable alerts. Its scalability ensures it can handle networks of any size, and detailed reporting offers historic data analysis.

System Requirements

The system requirements depend on the number of sensors installed.

Number of sensors	CPU	Memory	Disk space	User accounts
Up to 1,000 sensors	2 CPU cores	3 GB RAM	250 GB	Less than 30
1,000 to 2,500 sensors	3 CPU Cores	5 GB RAM	500 GB	Less than 30
2500 to 5000 sensors	5 CPU Cores	8 GB RAM	1 TB	Less than 20
5000 to 10,000 sensors	8 CPU Cores	16 GB RAM	2 TB	Less than 10

Price: The cost depends on the number of sensors you want to use. Here is a breakup of the cost, based on sensors.

• 100 sensors – free
• 500 sensors – $1,600
• 1000 sensors – $2,850
• 2500 sensors – $5,950
• 5000 sensors – $10,500

Who is it recommended for?

This tool is recommended for IT managers, network administrators, and businesses seeking granular control over their network monitoring. It is well-suited for organizations that require both real-time and historic data for performance analysis, and who operate networks with a variety of scales and complexities.

Besides these plans, PRTG also offers two plans called XL1 Unlimited and XL5 Unlimited. In XL1 Unlimited, you can install any number of sensors on one core installation while in XL5 Unlimited, you can install any number of sensors on five core installations. You can start with a 30-day free trial.

Paessler PRTG Start a 30-day FREE Trial

3. ManageEngine OpManager – FREE TRIAL

ManageEngine OpManager is a powerful and user-friendly network monitoring software that efficiently monitors even the most complex of networks.

Key Features

• Monitors routers, WAN links, interfaces, bandwidth, and more.
• Monitors VoIP call quality throughout the WAN infrastructure. It can even troubleshoot low-quality VoIP problems.
• Visualizes and resolves WAN or router problems.
• Maps the entire network to identify outages and performance issues.
• Always monitors WAN availability, latency, and performance using Cisco IP SLA technology
• Monitors both physical and virtual servers running different operating systems like Windows, Linux, Unix, Solaris, VMware, and more.
• Uses 70 different VMware monitors to monitor VMware devices.
• Uses WMI credentials to monitor Microsoft Hyper-V hosts.
• Monitors and manages the storage repositories of Citrix XenServer.
• Monitors processes that run on SNMP/WMI and CLI.
• Uses different protocols such as SNMP, WMI, and CLI to monitor resources and gather performance data.
• Helps to automate first-level troubleshooting steps.
• Comes with a rule-based trap processing engine that can handle more than 300 SNMP traps per second.
• Centralizes event log monitoring to monitor all critical security logs.
• Makes it easy for you to analyze systems trends and performance with its customized reports and templates.
• Gives deep insights into the performance and configuration of RAID devices.
• Monitors tap libraries to detect fault conditions and generate alarms.
• Analyzes historic as well as current usage trends.
• Automatically discovers fabric switches in your SAN environment.
• Scales to accommodate up to 10,000 devices and ensure high availability of the same.
• There is robust communication between the central and probe servers deployed in remote sites.
• You can get the log data generated by firewalls to get crucial information related to the security of your network.
• You can schedule configuration backups whenever required.
• Helps with switch port and IP address management.

Why do we recommend it?

We recommend ManageEngine OpManager for its extensive feature set that includes monitoring of routers, WAN links, VoIP call quality, and both physical and virtual servers across multiple operating systems. Its capacity to automate first-level troubleshooting adds an extra layer of efficiency.

Who is it recommended for?

ManageEngine OpManager is ideal for organizations with complex network infrastructures that include a mix of physical and virtual servers, various operating systems, and VoIP services. Its strengths in WAN monitoring and troubleshooting make it a strong candidate for businesses reliant on wide-area networks.

You can start by downloading a 30-day free trial.

ManageEngine OpManager Start a 30-day FREE Trial

4. Site24x7 – FREE TRIAL

If you like the full-stack monitoring capabilities of Nagios but you want to use a SaaS bundle instead of an on-premises software package, you should consider the cloud-based Site24x7.

Key Features

The important features of the Site24x7 platform are:

• Modules for network device monitoring and traffic analysis that provide network discovery, inventory creation, and topology mapping
• Constant network performance monitoring with the Simple Network Management Protocol (SNMP)
• Network traffic statistics gathering with NetFlow, J-Flow, sFlow, CFlow, IPFIX, NetStream, and AppFlow
• Quality of Service tracking for VoIP connections
• Protocol analysis
• Alerts for system performance drops or resource exhaustion
• Support for traffic shaping measures, such as queueing
• Network device configuration management
• Monitoring for cloud platforms, SaaS packages, and virtualizations
• Server resource monitoring
• Server processor activity monitoring
• Monitoring for storage arrays and cloud storage
• Internet connection testing between sites and to cloud systems
• Monitoring for applications, such as databases and Web servers
• Application performance monitoring that includes distributed tracing for microservices and code profiling
• Website availability testing
• Synthetic monitoring to check on the response times of various elements in a Web page
• Real user monitoring (RUM) to track the performance of websites
• Log management
• The ability to track assets on multiple sites in one account
• A multi-tenanted version for managed service providers

Why do we recommend it?

We recommend Site24x7 for its comprehensive full-stack monitoring capabilities that extend from network devices to cloud platforms and applications. Its versatility in gathering network traffic statistics and implementing traffic shaping measures sets it apart.

Who is it recommended for?

Site24x7 is an excellent choice for businesses that rely heavily on multi-layered IT infrastructures, including cloud platforms and SaaS packages. It’s also particularly beneficial for managed service providers due to its multi-tenant capabilities.

The Site24x7 system is offered in many plans. The starting price to get all of the modules on the platform is $9 per month when paid annually. You can get access to all of the modules on the platform with a 30-day free trial.

Site24x7 Start a 30-day FREE Trial

5. Zabbix

Zabbix is an enterprise-class monitoring system that is designed for monitoring different devices on a network.

Key Features

Some important features of Zabbix are:

• Collects metrics from any device, system, or applications.
• A native Zabbix agent, created using C language, runs on Unix, Linux and Windows to collect information such as CPU, memory, and CPU interface.
• It can collect data from devices with SNMP agent versions v1, v2, or v3 as well as printers, NAS and UPS. In fact, it can collect data from any device that can be monitored through SNMP agents.
• Zabbix also supports IPMI agents to get important information from hardware.
• You can also create custom agent checks.
• Custom scripts written in any language such as Perl, Python, and Ruby help to extend the functionality of this tool.
• Offers predictive functions that analyze incoming data to predict problems, so you can get to them proactively.
• You can retrieve and manage historical and configuration data.
• It also provides flexible and intelligent threshold definition options to minimize false positives and focus on the main issues.
• A trigger expression can be created with data obtained from different devices.
• Offers historical data analysis
• Takes into account the dependencies before sending out an alert.
• You can integrate Zabbix with third-party software.
• Sends notifications through many channels. You can even configure the channel for each kind of notification. For example, you can program the system to send you alerts through SMS if the criticality level is severe and through email, if it’s moderate.
• Comes with a native web interface that makes it easy to access information from anywhere/
• You can create any report with this tool.
• This web interface is the single point for configuration and for viewing all reports.
• It supports Unicode / UTF-8 for a local flavor.
• Works well on most modern browsers like Chrome, Firefox, Safari, Internet Explorer, Konqueror, and Opera.
• You can do a global search at any time.
• The interface comes with a host of themes, so you can customize it to match your preferences.
• There is strong encryption between all Zabbix components.
• Uses multiple authentication methods such as LDAP and Active Directory.
• Code is open for security audits.
• Installation is easy and can be done within minutes.
• Configuration templates help to monitor thousands of devices on your network.
• The Zabbix community has built hundreds of templates as well.
• You can also build custom templates too.
• Scans your network periodically to discover new devices and updates the topology map accordingly.
• Automatically starts monitoring new equipment, once they are discovered.
• Monitors behind firewall DMZ.
• Allows you to run scripts remotely on monitored hosts.
• Collects data even when there are network issues.
• Zabbix management can be done through APIs.
• You can create new applications to work in Zabbix.

Why do we recommend it?

We recommend Zabbix for its robustness in monitoring a wide array of devices and systems, including SNMP and IPMI agents. The tool’s predictive functions for proactive issue identification and flexible threshold options make it a comprehensive solution for network monitoring.

Supported platforms

Zabbix works well on the following platforms.

Platform	Zabbix Server	Zabbix Proxy	Zabbix Agent
Linux	Yes	Yes	Yes
IBM AIX	Yes	Yes	Yes
IBM Power8	Yes	Yes	Yes
FreeBSD	Yes	Yes	Yes
NetBSD	Yes	Yes	Yes
OpenBSD	Yes	Yes	Yes
HP-UX	Yes	Yes	Yes
Mac OS X	Yes	Yes	Yes
Solaris	Yes	Yes	Yes
Windows	No	No	Yes

Who is it recommended for?

Zabbix is highly recommended for enterprise-level organizations that require extensive monitoring across various device types and systems. Its support for custom agent checks and third-party software integrations make it a versatile option for businesses with complex and diverse network environments.

It is open-source and free to use. We’ve also written a post about the best Zabbix Alternatives.

6. Icinga

Icinga is an open-source network monitoring application that was originally created as a fork of the Nagios monitoring system. It was started to correct the shortcomings of the Nagios monitor and to add new features. It takes its name from a Zulu word that means examines, browses or looks for.

Key Features

• Scales up to thousands of nodes in a quick and reliable way.
• Its reporting module comes with an improved SLA, database connectors for PostgreSQL, and distributed systems to ensure redundant monitoring.
• Monitors network services, host services, and server components.
• Do parallel service checks
• Comes with a simple plug-in design, so you can easily develop your own service checks.
• You can define network host hierarchy, so there is a distinction between hosts that are way down and unreachable.
• Allows you to run defined handlers for proactive resolution of problems.
• Alerts can be escalated to other users or to other communication channels.
• There are many channels through which notifications can be sent.
• Comes with two optional web interfaces – Icinga Classic UI and Icinga Web.
• The reporting module is based on the open-source Jasper Reports.
• There are many reporting templates including those for capacity planning.
• It has a multithreaded design, so thousands of checks can be run simultaneously.
• Its distributed setup makes Icinga ideal for large and complex environments.
• Rules can be applied to hosts and services to create a continuous monitoring environment.
• RESTful API makes it easy to update your configurations or show the details you want, the on-the-fly.
• Supports Graphite and InfluxDB natively.
• You can get better insight into the performance of your devices with Icinga’s metadata.

Why do we recommend it?

We recommend Icinga for its scalability, offering reliable performance even for networks with thousands of nodes. Its distributed setup and RESTful API support make it adaptable and easy to configure, providing robust and continuous monitoring.

Who is it recommended for?

Icinga is best suited for larger organizations with complex, distributed environments. The system’s multithreading and rules-based monitoring make it highly customizable, an ideal fit for businesses that require a tailored, comprehensive monitoring solution.

It is open-source and free to use.

7. OpenNMS

OpenNMS is an open-source enterprise-grade network monitoring tool developed by the users and community of OpenNMS.

Key Features

The features of OpenNMS include:

• It is based on an event-driven architecture that allows flexible workflow integration.
• It normalizes device and vendor-specific messages and protocol-specific performance metrics, so everyone can understand.
• The data can be accessed through RESTful API.
• Sends notifications through multiple channels such as emails, Slack, MatterMost, and Jabber and even sends microblog notifications like Twitter.
• You can run external scripts to customize the notifications.
• Allows you to integrate with existing ticketing tools or with your own ticketing system.
• Alarms can be forwarded to applications too, so they can be integrated into your management workflow.
• Comes with a synthetic polling framework to test anything from IP stack to applications.
• It can test generic TCP connection, status and resources from management agents, measurements from open protocol and management agents, SNMP traps, and syslog messages.
• Database schema is controlled with Liquibase, so updates and maintenance are a breeze.

Why do we recommend it?

We recommend OpenNMS for its event-driven architecture, which allows for highly flexible workflow integration. Its ability to normalize device-specific messages and metrics makes it a universally comprehensible tool for any network team.

OpenNMS comes in two editions – Meridian and Horizon. Horizon is FREE, but Meridian comes with a yearly subscription.

Here are the differences between the two editions.

Feature	Meridian	Horizon
Environment:	Ideal for businesses looking for stable environment with good support	Ideal for monitoring new technologies and IT ecosystems like virtual machines and Docker.
Development model:	Open source	Open source
License:	AGPLv3 or proprietary license	AGPLv3
Release cycle:	Once every 12 months	3 to 4 months
Support:	Multiple options available	Community supported mailing lists and wiki
Maintenance:	Access to update server for latest releases or bug fixes	Community driven
Configuration:	Supports preconfigured events, workflows, reports, data collection and notices.	Configured and maintained by users and community.
Cost:	Yearly subscription for every management server	Free
Features:	Comes with features that support stability, usefulness and quality of integration with existing code.	Mainly explores new technologies to drive advances in management technologies.

Who is it recommended for?

OpenNMS is ideal for businesses looking for an open-source, highly customizable network monitoring solution. Its RESTful API and multiple notification channels make it a strong choice for teams that require seamless integration with existing systems and workflows.

Contact the support team for the cost of Meridian.

Conclusion

To conclude, there are many good alternatives for Nagios, and we hope the above options help you to make the right choices. We suggest you download one of the aforementioned software suites from above and give it a test in your environment.

Each of the software packages above has a different strength, weakness, and price point as well. Check out their features above and give several of them a try, and you’ll quickly know which one will serve you best – From our Experience, SolarWinds has a great Nagios Script Import feature that allows you to import scripts and eventually migrate them over. Give them a try if you want a fast solution.

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