iftop

iftop show bandwidth usage like top show cpu and memory usage.

To see network usage, run

iftop

If you have multiple network interface, you need to specify network interface to monitor, this can be done with -i option

iftop -i eth1

To install on CentOS, run

yum install iftop

For installing from source, see Install iftop from source on CentOS

On Ubuntu

apt -y install iftop

To use, run iftop