Internet Monitoring on a MAC

I suspect that one of my employees is doing inappropriate things on the internet from their work computer.  Their work computer is a MAC.  Is there a cheap (preferably free) method of monitoring their internet traffic?
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The best way to monitor is to set up logging on your router. What kind of router are you using?
deklinmAuthor Commented:
I am using a Cisco RV042G
If you have a Mac server on your network, it's pretty easy to turn on web proxy service and then set the client's computer to have to use that proxy. With one user, it won't even be noticeable, and with the logging on the Mac server, you can see what sites are being accessed. If the user is technically adept, however, he/she is likely to see what's going on if he/she gets into the network settings.
If Safari is the only browser used, Parental controls can be enabled on the user's account and the only setting enabled being web logging, which can also be monitored from another Mac on the network easily. But again, success depends on the technical knowledge of the user.
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