vnstat monitors network traffic in linux with a command line interface. It's very useful for keeping traffic database of your traffic as well as real time traffic numbers. It creates a database for the default interaface - enp2s0. You can check your exact interface names with ip addr. [donato@archdesktop ~]$ ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: enp2s0 : <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000 link/ether 78:24:af:36:61:21 brd ff:ff:ff:ff:ff:ff 3: wlp4s0 : <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether 28:f3:66:20:7a:1e brd ff:ff:ff:ff:ff:ff inet 192.168.15.3/24 ...