Specific traffic analysis

Solution 1:

ntop is a classic

Install

sudo apt-get install ntop

You will be asked to set a password during the install

point firefox to http://localhost:3000 or https://localhost:3001

log in with the username admin and the password you set.

notp will show you all sorts of information.

Small sample:

Solution 2:

I use nethogs ; it tells me the current usage and the processes:

NetHogs is a small 'net top' tool. Instead of breaking the traffic down per protocol or per subnet, like most tools do, it groups bandwidth by process. NetHogs does not rely on a special kernel module to be loaded. Homepage: http://nethogs.sourceforge.net/

It is available in the software center and repositories.