A favorite. Tells how much bandwidth is being used and also what protocol (service/port) and destination the transmission is taking place to.Very helpful when you want to know exactly what is using up your bandwidth
It has several options, can monitor multiple interfaces, can show multiple graphs in several rows or columns, and can even monitor the download speed of a single file (by watching the file size on disk).
Linux Monitor Download Speed
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IPTraf is a console-based network statistics utility for Linux. It gathers a variety of figures such as TCP connection packet and byte counts, interface statistics and activity indicators, TCP/UDP traffic breakdowns, and LAN station packet and byte counts.
An IP traffic monitor that shows information on the IP traffic passing over your network. Includes TCP flag information, packet and byte counts, ICMP details, OSPF packet types. General and detailed interface statistics showing IP, TCP, UDP, ICMP, non-IP and other IP packet counts, IP checksum errors, interface activity, packet size counts. A TCP and UDP service monitor showing counts of incoming and outgoing packets for common TCP and UDP application ports A LAN statistics module that discovers active hosts and shows statistics showing the data activity on them TCP, UDP, and other protocol display filters, allowing you to view only traffic you're interested in. Logging Supports Ethernet, FDDI, ISDN, SLIP, PPP, and loopback interface types. Utilizes the built-in raw socket interface of the Linux kernel, allowing it to be used over a wide range of supported network cards. Full-screen, menu-driven operation.
Local loopback All Linux-supported Ethernet interfaces All Linux-supported FDDI interfaces SLIP Asynchronous PPP Synchronous PPP over ISDN ISDN with Raw IP encapsulation ISDN with Cisco HDLC encapsulation Parallel Line IP
It monitors all interfaces at once, printing a new line every second. Useful to pipe into another script, or to leave running and observe the bandwidth usage over time. Not as pretty as other tools, but it gets the job done.
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Monitoring network bandwidth and performance is crucial for preventing malfunctions and ensuring network stability. Overall usage reports help determine bandwidth requirements, while real-time and more detailed process-level reports help identify high bandwidth usage sources and alert users about usage spikes or unusual activity.
Command-line network monitoring tools are an excellent choice for Linux servers without a graphical interface as they provide the metrics within the command line. The tools usually output a quick overview of network bandwidth metrics.
Note: CentOS, Rocky Linux, and other RHEL-based systems require the EPEL repository to install the tools listed in the article. Install the EPEL repo by running the following commands:
The iftop command is similar to the top command for monitoring CPU usage. iftop provides a real-time display of bandwidth usage by individual connection. It also generates an overview of the amount of bandwidth being used.
nload is a command-line utility for monitoring network traffic. This tool only reports inbound and outbound traffic. The output includes a graph, which is helpful for a quick overview of network traffic.
NetHogs is another tool similar to the top command. The utility generates real-time reports of network usage. NetHogs' key advantage is that it sorts the data by each process/application and usage, making it a great utility for tracking bandwidth spikes (when launched on time).
bmon monitors bandwidth utilization, along with keeping a running rate estimate. It provides usage for each device individually, allowing users to track bandwidth across multiple network adapters.
vnStat works by running a daemon that captures and records bandwidth data. It reads data from the kernel to stay light on resource usage. The tool can run in real-time by specifying the -l option. The key feature of vnStat are persistent records - as the daemon runs, it collects and stores bandwidth usage logs.
iPerf is a tool that monitors network bandwidth by protocol, such as TCP, UDP, and SCTP. This tool works best for tweaking and maximizing network performance for a particular protocol.
Note: nload and iftop are excellent command line tools for testing network speed. To learn more about other options, check out our article How To Test Network Speed In Linux Via CLI.
Netperf is similar to iPerf in terms of testing network performance. The tool helps monitor network bandwidth using Unix domain sockets, TCP, SCTP, DLPI, and UDP via BSD Sockets.
Like iPerf, Netperf also requires a server and a client for testing. Among its key features are the numerous predefined tests for measuring performance or data transfer speeds.
IPtraf is a Ncurses-based, user-friendly network monitoring tool. The utility is suitable for tracking inbound and outbound network traffic, monitoring IP traffic, and obtaining general interface network information and detailed interface statistics.
The Color Bandwidth Meter (cbm) is a small command-line utility that displays current network traffic on all devices connected to the network. The curses-based output is displayed in colors and shows each network interface, bytes received, sent, and total bytes.
The following tools are GUI-based, offering a more robust monitoring suite than the CLI-based ones. The output usually includes graphs and visually organized statistics, making it easy to monitor all network bandwidth and performance at a glance.
Nagios Core is an open-source, feature-rich, and free bandwidth monitoring app, which also offers a paid version with official support. The tool's interface is web-based and can monitor multiple services, such as HTTP, POP3, and SMTP.
Another great feature are the automatic alerts in case of issues, allowing users to resolve them as soon as they arise. Nagios also provides bandwidth monitoring in network devices, such as switches and routers, via SNMP, which facilitates finding possible bandwidth hogs.
The data logs it generates visually represent network performance or device load metrics and can be used to track and improve network performance. The app is great for both small and large commercial apps.
Cacti is a web-based network monitoring tool written in PHP, featuring an intuitive and user-friendly interface. Its key advantage is comprehensive data collection and reports on network bandwidth and other metrics, such as user access and permissions.
Cacti collects data using scripts and outputs clear charts and graphs, allowing users to pinpoint any bandwidth usage spikes or network issues quickly. All data is stored using MySQL databases and used to produce custom graphs.
Site 24x7's NetFlow Analyzer is a cloud-based network monitoring utility that provides a wide range of functions for multiple devices in a network. It implements various technologies, such as NetFlow, sFlow, and J-Flow, allowing users to collect stats for different apps and devices.
The tool can monitor source and destination devices, their interfaces, and traffic flow. Users can configure threshold values for all monitored metrics and receive alerts when thresholds are exceeded.
ManageEngine's NetFlow Analyzer is a flow-based network monitoring tool that provides traffic pattern analytics and bandwidth spike detection. Users can pinpoint network issues by analyzing traffic patterns and obtain details on devices, interfaces, or apps.
The Analyzer provides real-time monitoring and troubleshooting, facilitating the discovery of network issues as soon as they occur. The utility also features customizable reports, which are available with a few clicks. The supported flow technologies are NetFlow, sFlow, IPFIX, Netstream, J-Flow, and AppFlow.
Regarding pricing, the app comes in two flavors - Professional and Enterprise. The main difference is in the number of flows per second and the number of networks supported. There is also a free 30-day trial for both versions. The Free version is limited to monitoring up to two interfaces.
The NetFlow Traffic Analyzer by SolarWinds is a network monitoring utility featuring a wide range of monitoring functions and a scalable number of nodes in the network. The utility offers interactive and visualized data displays with color-coded and searchable visual data, making it intuitive and user-friendly.
In addition to network monitoring, NTA allows users to monitor bandwidth and get alerts when traffic issues arise or a device is malfunctioning. One of its key features is monitoring port 0 for unusual traffic, preventing attacks, and securing the network.
Darkstat is a lightweight and simple web-based network monitoring utility that can also run in the command line. The tool works in real-time, analyzing traffic and displaying network statistics in a graphical format over HTTP or in the command prompt.
Darkstat captures the system's traffic flow information and computer usage statistics and outputs the collected information in a graphical report. The visual representation makes it easy to notice any unusual usage spikes.
SARG is an open-source network and bandwidth monitoring app that analyses squid log files and produces detailed HTML reports on network usage. Reports include IP addresses, total bandwidth usage, bytes sent and received, visited sites, and more.
The tool is especially useful for monitoring network usage on individual machines connected to the same network. SARG generates the reports automatically, but it requires that the squid proxy server writes the log files for it to read from. 152ee80cbc
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