Bandwidth Monitoring

Hello there Techies,

I am looking for a solution to monitor users traffic. I would like to see real-time data on websites the users are on and the amount of bandwidth they are using. If available, I would love to have some sort of silent install on the user’s machines, so that they are unaware of my intent. I have looked around and found lots that promised to do what I am trying to accomplish, but they all are disappointing in the end.

Thanks!!