From ArchWiki

vnStat is a lightweight (command line) network traffic monitor. It monitors selectable interfaces and stores network traffic logs in a database for later analysis.


Install the vnstat package.


Start/enable the vnstat.service daemon.

Pick a preferred network interface and edit the Interface variable in the /etc/vnstat.conf accordingly. To list all interfaces available to vnstat, use vnstat --iflist.

To start monitoring a particular interface that was not referred to in the configuration file when the daemon was started, you must initialize a database first. Each interface needs its own database. The command to initialize one for the eth0 interface is:

# vnstat --add -i eth0

Remember to restart the vnstat.service daemon after you have added a new interface.


Query the network traffic:

# vnstat --query

Viewing live network traffic usage:

# vnstat --live

To find more options, use:

# vnstat --help

or to see all options use:

# vnstat --longhelp

Eye candy presentation of the data can also be achieved by vnstati(1), which is part of the vnstat package.