Hey I currently manage the wireless network at my home and my sister keeps on downloading massive amounts of data by the limewire network. Not all of it is illegal, but anyway, that's not the point. The problem is: it eats all the bandwidth and in Europe we still have those fracking bandwidth limitations so by the 2nd week of the month, our broadband is turned into smallband because we reached our monthly maximum. Now, is there a way to block limewire from connectiing to the internet, without completely blocking my sister's internet access? Our network consists of 2 Airport Extreme's in bridge mode (both in N), on one of these extreme's there's an Airport Express in B/G mode which is the one my sister connects to with her iMac. I was thinking of blocking some ports on the Airport Express, but I have no idea how to block them, or which ports to block... any help?