I have looked everywhere on the internet for a solution for this, however no one seems to have one. Im hoping the great people here on WHT may have a solution.
In my home network, i have a system running Softwall Linux. This is runnign as a dedicated firewall/router.
My sister, has her laptop and she is always using Skype. Our ISP limit us to 1GB of traffic a day and she is using it up rather swiftly. I cannot limit her installing ability because it is her laptop, i need to configure the gateway so that she cannot connect to it, and it cannot connect to her.