Right, next week I'm going on holiday and have bought a USB dongle, which I'm going to plug into my MBP and share the internet connection so that the other 7 people in the house can also access the internet. My question is: is there any software to monitor the usage of individual sharers? I have a 5GB limit, and if someone starts downloading all sorts, I have no desire to be coughing up the bill, any help?