nethogs is used to monitor network traffic. You can see which processes use the most bandwidth and hogs the network.

Installtion on debian:

apt-get install nethogs

You can give the nethogs a network interface to see what's going on under the hood:

nethogs eth0

The output would something like:

PID USER       PROGRAM                                                       DEV        SENT      RECEIVED
9023 root      python                                                        eth0        6.083     175.811 KB/sec
20745 root     python                                                        eth0        2.449      45.715 KB/sec
11934 www-da.. nginx: worker process                                         eth0      131.580      20.238 KB/sec
25925 root     /usr/bin/python                                               eth0        3.674      10.090 KB/sec

When nethogs is open, you can press r in order to sort based on RECEIVED or press s to sort based on SENT packets. To change the mode that it is shown for KB/sec press m multiple times and see the output.

#network #sysadmin #linux #nethogs #nethog #network #eth0