How to find out which sites users are sitting on?

Question

Computer networks

Greetings brothers in mind. Interested in such a thing: you need to find out which of the users staggers around the Internet while working + some kind of pad ... a bad person takes traffic. You need something free (understand and forgive) like a traffic inspector. Does such software exist somewhere? ATP in advance. Ps Google did not give anything intelligible.

Answer 1

You can easily install a dns server, for example, this docker image https://hub.docker.com/r/phensley/docker-dns/
Switch dns to yourself and see where users ask)

Answer 2

put squid, though, it won't burn the torrent

Answer 3

How to monitor the activity of all devices from the same network on the main computer?

Answer 4

Google badly.
Ntop-ng is here to help.