![]() īy default, iftop will look up hostnames associated with addresses and counts all IP packets that pass through the filter. iftop must be run with sufficient permissions to monitor all network traffic: on most systems this means that it must be run as a root user using the sudo command. If not, it will listen on the first interface it finds that appears to be external (with libpcap and libncurses). Iftop monitors network traffic and displays a table of current bandwidth usage. It is analogous to top, but instead of system-wide resource monitoring, it focuses on displaying network usage and statistics. By default, the connections are ordered by bandwidth usage, with only the "top" bandwidth consumers shown. Iftop is a free software command-line system monitor tool that produces a frequently updated list of network connections. ![]()
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