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When I open System Monitor, the Network History shows that there are ~64 KiB/s being downloaded constantly. And it's not my doing! So I wanted to see which application is downloading and I installed nethogs.

But according to nethogs my system's download speed is less than 1 KB/sec in total!! What's going on? How can I make sure who's telling the truth? Personally I trust System Monitor as I can completely feel the lack of bandwidth. Then I must ask how can I find the process responsible for the download?

Here's how I ran nethogs:

$ sudo nethogs eth0

And there are only two network interfaces on my machine, eth0 and lo, none of which is downloading the 64K!

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    You can use iftop as an additional source...
    – Jan
    Nov 7, 2014 at 16:22
  • But iftop does not tell me which application is downloading, does it?
    – Mehran
    Nov 7, 2014 at 17:29
  • Use iftop -nPB to look up the local port, then use sudo netstat -tup to locate the process "owning" that port.
    – Jan
    Nov 8, 2014 at 14:41
  • What if there's no port? iftop's first row is: 192.168.1.1 => 224.0.0.1 and it's eating most of my bandwidth! I know 224.0.0.1 is broadcast IP but why am I downloading from it?
    – Mehran
    Nov 8, 2014 at 17:46

1 Answer 1

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Make sure that pulseaudio isn't set to broadcast in your sound settings. I had the same "issue" with about 200KB/s showing up and nothing shows up in nethogs.

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