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How can I know which application is using the most network bandwidth? I saw some graph from KDE's network monitor, but don't know which process did that.

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up vote 3 down vote accepted

As far as I know, iftop can not show which processes are using the bandwidth. If you need this information, you should check out nethogs.

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You have an iftop utility.

See this question, there's also ifstat.

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