Is there anyone out there familiar with command line where perhaps I could enter something in the IP tables to enable usage based access restrictions for a specific MAC address? Here is the situation: I am helping a friend out by setting up his router to control internet usage by his kids in his home. I have time based Access Restrictions enabled with filters for a specific MAC address. During 8am to 3pm, social networking, videos, and other non-necessary sites are blocked so my friends kids can get their work done (they are home schooled and do much of their work on the computer). I want to set something up so that after 3pm, a usage based restriction comes into effect for a specific computer (I have the MAC address). Free access to the internet can be used, but only for two hours. If the user logs off (or shuts down the computer... I don't know how this will work), then the usage accumulation will stop. As soon as my friend's child gets back on the computer, the usage resumes. When it runs out, the internet is blocked. Is this even possible?