iftop is a command-line system monitor tool that produces a frequently-updated list of network connections. By default, the connections are ordered by bandwidth usage, with only the “top” bandwidth consumers shown. iftop must be run with sufficient permissions to monitor all network traffic on the interface.

Step 1. Installation.

apt-get install iftop

Step 2. Usage.

iftop is easy to use if you just want to see your current network connections and how much bandwidth is being used by each remote host.

Simply launch it from the command line, passing the -i option with the interface you want to monitor, and optionally the -B option to display values in bytes.

Some other options:

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