Linux – How to find process which uses most bandwidth

bandwidthlinuxnetworkingtcp

How can I find the process which uses most bandwidth on a Linux PC?

With iftop it's possible to find which connections produce most bandwidth, but how to find the process?

nethogs is something similar, but shows also the process (http://nethogs.sourceforge.net/)

The information you're after is all in the logs, so you should look at a log analyzer such as AWStats. The other option is to use Google Analytics.

For analyzing the logs, here's a rough example which you can use to tell you how many MB of traffic a log file reports from the command line:

cat /var/log/apache/access.log | awk '{SUM+=$10}END{print SUM/1024/1024}'

If you already know WHICH server is "bleeding" bandwidth you might just want to try something as simple as installing your IPTraf package.