To get an overview of options during runtime, simply press h ( Figure 2). Iftop doesn't have a lot of bells and whistles. The three columns on the right show the cumulative progress in the previous 2, 10, and 40 seconds. The second column shows the cumulative values over the observed period. With more active network connections than can fit on the screen, you can scroll through using the vim keybindings j for scrolling down and k for scrolling up.Īt the bottom edge, iftop shows the transmitted TX, received RX, and TOTAL data transfers. In that way you can see at a glance which data stream is using the most bandwidth. The width of the bar shows the proportion of the connection to the total data transferred. Per transmission, you'll see a black bar that highlights the connection. The columns on the right show the data transfer rates for the last 2, 10, and 40 seconds, respectively. If specified, iftop will only include packets flowing in. The columns show the source and destination of the connection along with the values for a successful data transfer. -F net/mask, Specifies an IPv4 network for traffic analysis. A small arrow shows the direction: => is the send direction and <= is the receive direction. The first line is the send and the second line is the receive. The active network connections are displayed in two lines with five columns in each. Figure 1: The iftop display shows the source without domain name but with port, and destination with domain name and protocol.
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