Which process is eating my connection? I found something is eating 100KB of my rx Internet connection.
 Doing iftop I found that most data is coming from 69.31.72.192.

Running this command line:

lsof -P -i -n | cut -f 1 -d " " | uniq


the list of processes is this

UserEvent
SystemUIS
Finder
sharingd
Dropbox
Google


Dropbox syncing is paused, Google goes away if I close Chrome, but the connection
is eaten anyway...

I came from linux and it is really shocking to see the system eating resources without knowing what is going on... 

My four suspects are 

UserEvent
SystemUIS
Finder
sharingd


I actually have two questions:


How can I check which is the exact process that eats the connection?
Can I take control on how the process(es) use my connection (which is really limited)?
Activity Monitor has a network tab which should show you what you need. It has columns for process and sent/received packets &amp; bytes.