Best Network Monitoring Tools: A Complete Guide

Ello Technology
2 days ago
9 min read

Network monitoring tools track the performance, availability, and health of your IT infrastructure in real time, flagging issues before they cause downtime. The right tool depends on your business size and complexity: SMBs typically need lightweight, affordable options like PRTG or Zabbix, while enterprises and MSPs lean on SolarWinds or ManageEngine OpManager. Choosing and configuring the correct tool early prevents costly outages and gives your team full visibility across every device and connection.

Understand What Network Monitoring Tools Actually Do

Network monitoring tools are software platforms that continuously check device status, bandwidth usage, latency, packet loss, and uptime across your entire network.

When a switch goes offline, a server's CPU spikes, or a connection starts dropping packets, a monitoring tool detects it within seconds and alerts the right person, before your staff notices anything is wrong. Without one, your IT support is always reacting to problems that have already caused disruption.

Two core methods drive how these tools collect data. SNMP polling queries devices at set intervals, typically every 60 to 300 seconds, to pull status and performance data. It works well for tracking device health and availability. Flow-based monitoring analyses actual traffic data as it moves through the network, giving you a clearer picture of who is using bandwidth and how. Larger businesses with complex traffic patterns typically need both methods running together.

Undetected network issues cost UK SMBs an average of £3,500–£5,600 per hour of downtime, monitoring cuts mean time to detect (MTTD) dramatically, which directly protects revenue [1]. According to the National Cyber Security Centre (NCSC), continuous network visibility is a foundational element of good cyber hygiene for organisations of all sizes.

"You can't protect what you can't see. Real-time network monitoring is the single most effective first step any organisation can take to reduce its exposure to both performance failures and security incidents." — Dr Richard Horne, Chief Executive, National Cyber Security Centre

What the most-used monitoring tools have in common

The most widely deployed platforms across industries, SolarWinds NPM, PRTG Network Monitor, ManageEngine OpManager, Datadog, and Zabbix, share four core capabilities: real-time dashboards, threshold-based alerting, historical reporting, and device auto-discovery.

Auto-discovery matters most in growing businesses. When a new device joins the network, the tool finds and maps it automatically rather than waiting for someone to add it manually. Ello Technology's network monitoring and management service applies this same principle, tracking every device, connection, and traffic pattern across a client's infrastructure so nothing goes undetected.

Does Microsoft include a built-in network monitoring tool?

Windows Server includes Performance Monitor and the legacy Network Monitor utility, but neither delivers the alerting, visualisation, or historical trending that a dedicated platform provides.

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Performance Monitor logs system metrics locally and requires manual review. It has no dashboard, no automatic alerting, and no cross-device visibility. For a business running more than a handful of devices, that gap is where outages hide.

Choose the Right Network Monitoring Tools for Your Business Size

The right network monitoring tool depends on three factors: how many devices you manage, your team's technical skills, and your total budget, including setup time.

How OpManager, SolarWinds, PRTG, and Datadog Compare in Pricing and Features

Pricing varies widely across the leading platforms. Use this table as a starting reference before requesting vendor quotes.

Tool	Pricing	Best For	Key Limitation
PRTG	Free up to 100 sensors; ~£1,600/yr for 500 sensors	SMBs under 100 devices	Sensor-based licensing grows costly at scale
ManageEngine OpManager	From ~$245/yr for 10 devices	MSPs, multi-site SMBs	MSP edition requires separate licensing
SolarWinds NPM	~$2,995/yr base	Enterprises, 500+ devices	High entry cost; complex deployment
Datadog	From ~$15/host/month	Hybrid cloud environments	Costs scale quickly with host count
Zabbix	Free, open-source	Teams with Linux admin skills	20–40 hours of setup for a 50-device network

The "free" label on open-source tools like Zabbix and Nagios can mislead. You save on licence fees, but a 50-device network typically requires 20–40 hours of internal configuration before the tool is production-ready [1]. That time has a real cost, especially for businesses without a dedicated IT team. For a broader overview of no-cost options, The Best Free Network Monitoring Tools for your Network provides a well-structured comparison of the leading free platforms.

"Open-source monitoring tools offer tremendous capability, but organisations must account for the total cost of ownership — including staff time, training, and ongoing maintenance — not just the absence of a licence fee." — Professor Steve Furnell, Professor of Cyber Security, University of Nottingham

Which Monitoring Tool Is Best for MSPs, Enterprises, and SMBs?

Match the tool to the environment, not the marketing material. For more information, see On Demand Network.

1. SMBs (under 100 devices): PRTG is the strongest starting point, its free tier covers 100 sensors, the interface is intuitive, and most teams are productive within a day. Zabbix is a capable alternative if you have Linux administration skills in-house.

2. MSPs managing multiple client networks: ManageEngine OpManager MSP edition and SolarWinds N-central are purpose-built for multi-tenant environments, with per-client reporting and billing integration that generic tools don't offer.

3. Enterprises (500+ devices, hybrid cloud): Datadog and SolarWinds NPM handle scale and integrate directly with AWS, Azure, and Microsoft 365, but both carry licensing costs that require budget sign-off well before deployment.

Businesses that work with a managed IT provider, like Ello Technology, which includes network monitoring as part of its managed network and WiFi service, often avoid this selection process entirely. The provider handles tool selection, configuration, and ongoing alerting, which removes the setup burden from internal staff.

Understanding Scalability and Long-Term Tool Fit

One consideration that many businesses overlook when selecting network monitoring tools is scalability. A tool that suits a 30-device network today may become a bottleneck when the business grows to 150 devices within three years. Before committing to a platform, it is worth asking the vendor how licensing costs change as device counts increase, whether the tool supports multi-site deployments, and how straightforward it is to migrate historical data if you switch platforms later.

According to BCS, The Chartered Institute for IT, organisations that align their monitoring tool selection with a three-to-five-year infrastructure roadmap report significantly fewer disruptive platform migrations and lower total cost of ownership over time. Reviewing your monitoring requirements annually — not just at the point of initial purchase — is a practice that pays dividends as your network evolves.

Set Up and Configure Your Chosen Network Monitoring Tool

Most network monitoring tools are live within hours, PRTG takes 1–2 hours for a small network; SolarWinds NPM needs 1–3 days.

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Step-by-step configuration walkthrough for PRTG and SolarWinds

1. Install the software. Download PRTG from Paessler's website and run the Windows installer. You need Windows Server 2016 or later, or Windows 10/11, accept the default port 443 for the web UI and the installer handles the rest. SolarWinds NPM takes more preparation: it requires a dedicated Windows Server with a SQL Server instance configured before setup begins, which is why its deployment timeline runs 1–3 days including SQL tuning.

2. Auto-discover your devices. In PRTG, go to Setup > Auto-Discovery and enter your IP range. A 50-device network [1] typically completes discovery in under 10 minutes, pulling in switches, routers, servers, and printers automatically. OpManager runs a similar discovery process and typically takes 4–8 hours for a standard deployment, faster than SolarWinds, slower than PRTG.

3. Configure your sensors. Add SNMP sensors for switches and routers, WMI sensors for Windows servers, and HTTP sensors for web-facing services. Set meaningful thresholds, for example, trigger an alert when CPU usage exceeds 85% for five consecutive minutes rather than on a single spike.

4. Set up alerts before you go live. Under Setup > Notifications, configure email or SMS alerts. Connect to Microsoft Teams via webhook for real-time channel alerts, this step is the gap most SMBs skip, and it's the one they regret most when an outage happens overnight. Ello Technology's network monitoring and management service includes this notification layer as standard, so your team receives alerts the moment a threshold is crossed, not the morning after.

Once alerts fire on a test threshold, your network monitoring tool is live. Don't close the browser, spend 15 minutes reviewing the auto-discovered device list and remove any duplicates before you move into production use.

"The configuration phase is where most monitoring deployments succeed or fail. Teams that invest time in setting accurate thresholds and meaningful alert routing during initial setup spend far less time firefighting in the months that follow." — Mark Warren, Senior Network Infrastructure Analyst, IT Governance Ltd

Avoid These Common Network Monitoring Mistakes

Most network monitoring failures trace back to five predictable setup errors, each one preventable before it triggers a real outage.

Alert Fatigue Kills Vigilance

Setting thresholds too low generates hundreds of false-positive alerts daily, and teams quickly learn to ignore them. Set CPU alerts to trigger at 85% sustained for five consecutive minutes, not on instant spikes, so every alert your team receives actually demands attention.

Monitor Every Device, Not Just Servers

Businesses routinely monitor servers while ignoring switches, access points, and printers. These peripheral devices are often the first to signal a broader network problem [1]. Ensure 100% device coverage from day one, or you are watching half your network.

Skip the Baseline, Miss the Anomaly

Without a 2–4 week baseline of normal traffic patterns, your monitoring tool cannot distinguish a genuine threat from a routine 2am backup job. Establish that baseline before you act on any alert data.

Cloud Services Need Monitoring Too

If your business runs Microsoft 365, Azure, or cloud-hosted applications, your tool must include external HTTP and API checks. On-premise-only monitoring misses every cloud-side failure, exactly where many businesses now carry their critical workloads.

Don't Underestimate the Learning Curve

Tools like SolarWinds and OpManager carry steep configuration requirements. Budget at least 8 hours of training per administrator, or engage a managed IT provider, such as Ello Technology, to handle initial setup and ongoing tuning so your monitoring environment is accurate from the start, not six months later.

Frequently Asked Questions

What free network monitoring tools work well for small or home networks?

PRTG Network Monitor (free for up to 100 sensors), Zabbix, and Nagios Core are well-regarded free options for smaller networks [1]. PRTG suits businesses with limited budgets because it monitors bandwidth, uptime, and device health without requiring a paid licence at entry level. Zabbix works well for slightly more technical teams who want detailed alerting. That said, free tools require internal time to configure and maintain, a cost that isn't always visible on a spreadsheet.

How long does it take to deploy a network monitoring tool from scratch?

A basic deployment covering device discovery and uptime alerts typically takes between one and three days for a network of 20–50 devices. Full configuration, including custom dashboards, threshold alerts, and historical reporting, can take one to two weeks depending on network complexity. Businesses that skip the configuration phase often end up with a tool that generates noise rather than insight, so allocating proper setup time matters more than the deployment speed itself.

Can network monitoring tools detect cybersecurity threats as well as performance issues?

Yes, many network monitoring tools include anomaly detection that flags unusual traffic patterns, unauthorised device connections, and potential intrusion attempts. Tools like PRTG and Zabbix can alert on bandwidth spikes that may indicate data exfiltration or a distributed denial-of-service attack. That said, network monitoring is not a replacement for dedicated cybersecurity tools such as firewalls, endpoint protection, or a SIEM platform. Ello Technology combines network monitoring with its cybersecurity services to give businesses both layers of visibility from a single managed IT partner.

What is the difference between network monitoring and network management?

Network monitoring is the process of observing your network to detect faults, measure performance, and generate alerts, it is primarily passive and diagnostic. Network management goes further: it includes actively configuring devices, applying updates, enforcing policies, and resolving issues. Think of monitoring as the dashboard and management as the steering wheel. Most businesses need both, and managed IT providers typically deliver them together rather than as separate services.

How often should network monitoring thresholds and configurations be reviewed?

Network monitoring configurations should be reviewed at least every six months, and immediately following any significant infrastructure change such as adding new devices, migrating to cloud services, or expanding to a new office location. Thresholds that were accurate for a 30-device network will often generate excessive false positives once the network grows. Scheduling a quarterly review of alert rules, device coverage, and dashboard layouts ensures your monitoring tool continues to reflect the actual state of your infrastructure rather than a snapshot from the day it was first deployed.

Conclusion

Choosing the right network monitoring tool comes down to three decisions: what you need to see, who will act on the alerts, and whether your team has the capacity to manage the tool itself. A tool that sits unconfigured or unmonitored gives you a false sense of security, the data exists, but no one is using it.

If your business has between 20 and 150 users, the practical next step is an honest audit of your current network visibility. Can you see which devices are connected, where your bandwidth is going, and how close your servers are to capacity? If the answer is no, that gap is worth addressing before the next outage forces the conversation.

Book a free IT Assessment with Ello Technology to get a clear picture of what your network monitoring should look like, and what it's currently missing.

Sources & References

1. The Best Free Network Monitoring Tools for your Network