| If you price your product on the assumption that the average customer only | uses 5% of their bandwidth then it doesn't take many customers using 50% | or 100% of it to really spoil your economics. Turn this assumption a part of the service: place a monthly transfer limit of some gigabytes. This will also scare p2p heavy-users and leave you with the high-margin low-usage customers. | Banning NAT and servers is a simple way to filter out most of the "power | users" without scaring the "mom and pop" customers with bandwidth and | download quotas. NAT doesn't always imply simultaneous users. Many people use it for security, I personally use for a 2-computer network with my desktop and my notebook, but never use both at the same time... Rubens