Does anyone have a utility for monitoring user activity on the network?

Question

Information Security

Shalom, ladies and gentlemen, we need a utility that could block access to a number of sites, and it is important that initially all sites are blocked in order to manually allow access to them. also important. so that it works on schedule and is free (a crack will do).
Thank you all in advance

Answer 1

I remember my Zyxel Keenetic Giga could do this. I blocked all ports/sites according to the schedule and made a white-list with access.
Dig towards some TrafficInspector. Or the same Kaspersky Parental Control can do this.

Answer 2

The best firewall (pfsense is free, kerio control is paid with a crack crack)
And nothing will slip through without your knowledge)

Answer 3

correct hosts file?