Option it is possible to get iftop to show packets entering and The filter, and the direction of the packet is determined according to theĭirection the packet is moving across the interface. Or switch it off entirely, by using the -n option or by pressingīy default, iftop counts all IP packets that pass through You may wish to suppressĭisplay of DNS traffic by using filter code such as not port domain, Itself, and may result in a confusing display. Pcap(3) for more information, but on most systems this means that itīy default, iftop will look up the hostnames associated Permissions to monitor all network traffic on the interface see Interface, or on the first interface it can find which looks like anĮxternal interface if none is specified, and displays a table of currentīandwidth usage by pairs of hosts.
Iftop listens to network traffic on a named Iftop - display bandwidth usage on an interface by host SYNOPSIS
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