7 Best Free and Open Source Console Based Network ‘top’ Tools

Out of the myriad of utilities that are available for Linux, top is a troubleshooting tool that often comes up in conversation. With good reason, top is a tool that many users frequently turn to. It is is a small open source utility that offers a dynamic real-time view of a running system, allowing users to monitor the processes that are running on a system, and to identify which applications are consuming more resources than they should. While top (and other alternatives) are useful tools to monitor the running processes on a system, functionality does not extend to network activity.

Command-Line InterfaceMonitoring processes is not, in itself, sufficient to ensure a smoothly running system. Network monitoring tools can help to identify issues before they escalate to emergency status. This type of software is not only useful for network administrators. Home users with a small network or even just a single computer will benefit from the software featured in this article.

The focus here is not to identify software that provides general system monitoring solutions. We covered the finest open source system monitoring tools in a separate article. Instead, the purpose of this article is to identify small console based utilities that show network usage in a way reminiscent to what the top utility does for processes. Rather than borrowing code from top, the small tools here borrow ideas from that troubleshooting tool, such as providing instant real-time data about a system that updates as the situation changes. If you are looking for small tools to diagnose TCP and UDP connection issues in real time and other related issues, to help isolate the causes of network problems, and to monitor bandwidth that is being consumed by applications and users, the software featured in this article will be of interest.

Our ratings chart captures our verdict. All the software featured is free and open source.

Ratings chart for the best free and open source network top tools

Click the links in the table below to learn more about each tool.

Network 'top' Tools
ntopngWeb-based network traffic monitoring application with an open source version
NetHogsGroups bandwidth by process
nloadReal time network traffic monitor for the text console
IPTraf-ngFork of IPTraf
iftopDisplays bandwidth usage on an interface by host
ntopNetwork traffic probe that shows the network usage
IPTrafInteractive Colourful IP LAN Monitor

This article has been revamped in line with our recent announcement.

Best Free and Open Source SoftwareRead our complete collection of recommended free and open source software. Our curated compilation covers all categories of software.

The software collection forms part of our series of informative articles for Linux enthusiasts. There are hundreds of in-depth reviews, open source alternatives to proprietary software from large corporations like Google, Microsoft, Apple, Adobe, IBM, Cisco, Oracle, and Autodesk.

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