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This question already has an answer here:

I am using Ubuntu 14.04. My internet connection is pretty slow (512 kbps). Sometimes I see that I have no software running which should download anything from the internet, but the system monitor still shows that some download is going on. So I think some hidden software are causing this. Is there a way I can monitor every software that is using internet?

marked as duplicate by terdon Jun 7 at 10:22

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • @Braiam: That question is about monitoring total network data usage across system restarts. – David Foerster May 17 '17 at 13:21
  • @codeaviator: I think the answers on this question are better than on the one behind your link. We should either have the duplicate flag point the other way around or merge them altogether. I'm raising a flag for the latter. – David Foerster May 17 '17 at 13:22
  • @DavidFoerster Good point. I'm raising a moderator flag in favor of merging both questions. – codeaviator May 18 '17 at 4:49
  • 1
98

You can use nethogs Install nethogs tool to monitor all your traffic on an interface.

Install it using

sudo apt-get install nethogs

Now run it using

sudo nethogs <interface name>

For example

sudo nethogs wlan0

enter image description here

For more detail type man nethogs after installing.

  • Anyway to set bandwidth parameters on the applications? – Karl Morrison Jun 29 '15 at 17:57
  • No, this tool only monitors bandwidth. If you are looking for something similar to bandwidth shaping, you can refer this post. – g_p Jun 29 '15 at 18:16
  • 3
    If you have 'creating socket failed while establishing local IP - are you root?' despite being root, then see the answer at askubuntu.com/a/729560/67747 – sage May 6 '16 at 16:36
  • Brilliant just what i was looking for! – Louwki May 17 '16 at 14:07
  • sudo nethogs eth0 for default. – Travis van der Font Aug 22 '17 at 21:03
10

I prefer sudo netstat -tunap

vinny@vinny-Bonobo-Extreme:~$ sudo netstat -tunap 
[sudo] password for vinny: 
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:8200            0.0.0.0:*               LISTEN      1160/minidlnad  
tcp        0      0 127.0.1.1:53            0.0.0.0:*               LISTEN      927/dnsmasq     
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      2543/cupsd      
tcp        0      0 192.168.2.10:58491      198.252.206.149:443     ESTABLISHED 30401/firefox   
tcp        0      0 192.168.2.10:39824      173.194.219.189:443     ESTABLISHED 30401/firefox   
tcp        0      0 192.168.2.10:58569      198.252.206.149:443     ESTABLISHED 30401/firefox   
tcp        0      0 192.168.2.10:59283      173.194.219.18:443      ESTABLISHED 30401/firefox   
tcp6       0      0 ::1:631                 :::*                    LISTEN      2543/cupsd      
tcp6       1      0 ::1:60390               ::1:631                 CLOSE_WAIT  863/cups-browsed
tcp6       1      0 ::1:34718               ::1:631                 CLOSE_WAIT  1469/plasmashell
tcp6       1      0 ::1:60391               ::1:631                 CLOSE_WAIT  863/cups-browsed
udp        0      0 0.0.0.0:1900            0.0.0.0:*                           1160/minidlnad  
udp        0      0 0.0.0.0:10097           0.0.0.0:*                           26759/dhclient  
udp        0      0 0.0.0.0:5353            0.0.0.0:*                           759/avahi-daemon: r
udp        0      0 0.0.0.0:39609           0.0.0.0:*                           759/avahi-daemon: r
udp        0      0 192.168.2.10:57168      0.0.0.0:*                           1160/minidlnad  
udp        0      0 127.0.1.1:53            0.0.0.0:*                           927/dnsmasq     
udp        0      0 0.0.0.0:68              0.0.0.0:*                           26759/dhclient  
udp        0      0 0.0.0.0:631             0.0.0.0:*                           863/cups-browsed
udp6       0      0 :::5353                 :::*                                759/avahi-daemon: r
udp6       0      0 :::13818                :::*                                26759/dhclient  
udp6       0      0 :::39404                :::*                                759/avahi-daemon: r

shows even system proses that is using the network and the name of them.

but not really a monitor as you half to keep running it to see changing output.

  • doesn't work on macOS. – HappyFace May 6 at 5:41
8

Just a bit more comfort with netstat sudo watch -n1 netstat -tunap

It will refresh the data each 1s

  • This should be an edit to the existing answer above... – Fabby Aug 28 '17 at 20:36
6

The iptraf utility is another way to monitor the traffic, provided by the iptraf Install iptraf package. sudo apt-get install iptraf installs it.

iptraf is available in Red Hat Linux also; run yum install iptraf as root to install it.

4

Terminal tool: netstat -tnp . -n option is to show numerical address (ip) to which connection is established, -p is program which has established that connection, and -t lists all tcplimits to tcp connections. Alternativelly, you could use netstat -a > networkscan.txt to output everything into a txt file

1

Socket Statistics, ss

ss is the modern alternative to netstat.

sudo apt install iproute2  # Install

Usage example:

watch -n1 sudo ss -ntp  # Do not try to resolve service names. TCP. View processes
0

There is a more modern alternative to ss by now :)

ss2(pyroute)

  • 2
    While this link may answer the question,it's better to include essential parts here. – Codito ergo sum Mar 16 at 8:18

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