Install iftop by entering the following commands in the terminal:
sudo apt update sudo apt install iftop
Description:
displays bandwidth usage information on an network interface
iftop does for network usage what top(1) does for CPU usage. It listens to network traffic on a named interface and displays a table of current bandwidth usage by pairs of hosts. Handy for answering the question "Why is my Internet link so slow?".
Homepage: http://www.ex-parrot.com/~pdw/iftop/
Version: 1.0~pre4-4
Section: universe/net