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Using vnstat, I observed a lot of uploaded data from my computer and I don't know which process sent data out of my computer. Is there a tool to get stats on how much data a process consumed during a period of time? Thank you.

Update: Looks like the process isn't sending data anymore, I installed nethogs to monitor live data transfer and everything seem totally normal.

Update: Seems nethogs doesn't see the process which is sending data, the system monitor shows more data than nethogs. (see picture)

System monitor shows the real data sending but can't tell which process is sending that data

Update: After a long time of investigation, it poped in my mind that few months ago, I added in my crontab, a ping each 5 minutes to one of my website on Heroku to prevent the dyno to fall asleep. I remove this task and no more mysterious data sending. It is weird that nethog was not able to spot that. Thank you for the help!

PS: It didn't work to ping the dyno on Heroku to prevent it to fall asleep.

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You could install the package nethogs if it is available for your system. This command is similar to top and will show you your running processes and how much network traffic they are generating. Use this command sequence:

nethogs
nethogs my_interface(s)

If nethogs is not available you might try the iptraf command which will sort connections by usage. Then you can find the port and enter lsof -i:the_suspect_port

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  • See askubuntu.com/q/726601/15729. The version in jessie has the "creating socket failed while establishing local IP - are you root?", so I assume it is broken. Apr 30, 2016 at 7:43
  • Note: 0.8.1 is easily backportable from unstable. I don't know why they haven't fixed/replaced the jessie version. – Apr 30, 2016 at 9:54

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