This means that I can "appear" on your server coming from the same IP of another player a bunch of kilometers from my apartment... we are not sharing the same PC, we are not cheating, we are just natted from the same router at our ISP and we are not using public IP addresses.
This happens with my provider, but can happen also with other ISPs that are selling the same kind of connection.
Keep it in mind now that the game is growing... don't want to get banned
