This can cause substantial traffic of itself, and may result in a confusing display. iftop must be run with sufficient permissions to monitor all network traffic on the interface see pcap(3) for more information, but on most systems this means that it must be run as root.īy default, iftop will look up the hostnames associated with addresses it finds in packets. Iftop listens to network traffic on a named interface, or on the first interface it can find which looks like an external interface if none is specified, and displays a table of current bandwidth usage by pairs of hosts.
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