What’s actually slowing this PC down?
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For a quick view of current traffic, use nload. To see which pairs of hosts are exchanging data, use iftop. For hourly, daily, and monthly usage history, use vnStat. If you need several interfaces visible together, consider bmon.
These tools answer different questions: nload and bmon show interface traffic, iftop breaks current traffic down by host pair, and vnStat reports stored counter history. None of the three primary tools identifies bandwidth use by process.
Which command-line bandwidth monitor should you choose?
| Tool | What it shows | Time horizon | Best for | Setup or permissions |
|---|---|---|---|---|
| nload | Incoming and outgoing traffic for an interface, with graphs and transfer totals | Live | Checking how fast a link is moving now | Reads interface traffic counters; check your distribution’s package repository for installation |
| iftop | Current bandwidth use by pairs of hosts on a selected interface | Live | Finding which remote hosts are using bandwidth | Packet-capture permissions are generally required; many systems require root |
| vnStat | Stored traffic totals for an interface | Historical: hourly, daily, and monthly reporting | Reviewing data usage over time | Requires a background collector, vnstatd, and time to build a database |
| bmon | Traffic counters from multiple interfaces, with different display modes | Primarily live monitoring | Comparing interfaces in one terminal view | Uses available input methods; installation depends on your distribution |
For a single machine, start with the question you need answered: “How fast is this link now?” points to nload; “What is using my bandwidth?” points to iftop; “How much did we use this month?” points to vnStat. Linuxize’s comparison, updated May 28, 2026, documents repository installation for common distributions; package names and service setup can differ, so check your OS repositories. Linuxize’s command-line bandwidth-monitor comparison.
1. nload: best for a quick live interface view
Debian’s nload man page describes it as “a console application which monitors network traffic and bandwidth usage in real time.” It displays incoming and outgoing traffic as separate graphs and includes transfer totals, making it a straightforward way to see whether an interface is busy and in which direction traffic is flowing.
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- Show app bandwidth usage
- Show open sockets
- Show network data usage statistics
Use nload when you need an at-a-glance live view rather than a breakdown of individual connections or a record of past usage. It reports interface traffic, not which program on the machine created it.
2. iftop: best for seeing which hosts use bandwidth
The iftop man page says it listens to traffic on a named interface and displays current bandwidth use by pairs of hosts. That makes it the better choice when a live total is not enough and you want to identify which host pairs are exchanging traffic.
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iftop observes network traffic; it does not provide a process-by-process view. It also needs packet-capture permissions. On many Linux systems, that means running it with root privileges; the exact permission model depends on how the system is configured.
3. vnStat: best for historical usage and planning
vnStat is the choice for questions about past usage, such as how much traffic an interface handled today or this month. It relies on interface counters and saves samples so its command-line queries can report historical totals.
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How vnStat collects data
The vnStat installation documentation distinguishes the query command, vnstat, from the background collector, vnstatd. The daemon retrieves, caches, and stores traffic data; the command reads the resulting database. Because the database is not updated constantly, useful output may not appear immediately after installation. Leave the collector running to build a history before relying on longer-period reports.
Install and enable the collector
On Debian- and Ubuntu-based systems, the documented repository installation pattern is:
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sudo apt install vnstatEnable the service using the service manager and service name provided by your distribution. Confirm the service is running, then allow it to collect samples. The package command and service setup are distribution-specific; consult your OS documentation if the command or service name differs.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When bmon is the better fit
The bmon man page describes bmon as “a portable bandwidth monitor with multiple input methods and output modes.” Choose it when you want several interfaces listed together or need a different display mode. It is an interface-oriented monitor, not a host-pair breakdown like iftop or a historical database like vnStat.
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For example, a server with separate wired, wireless, or virtual interfaces can benefit from viewing their counters together. The exact inputs available depend on the system and bmon’s build.
Install the tool that matches your system
Package names and availability vary across distributions and releases. Check the repositories configured for your OS before installing. For example, Linuxize documents sudo apt install bmon for Debian- and Ubuntu-based systems; vnStat installation uses sudo apt install vnstat and also requires its collector service to run. These are not universal commands for every Linux distribution.
nload and bmon are useful for live interface counters, iftop needs packet-capture access to inspect host-pair traffic, and vnStat needs a running collector and a populated database. Choose according to whether you need a live rate, a host-pair view, multiple interfaces, or a usage history.
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