[throwaway7767]

It's really curious, because even when ISPs have QoS setups they can't seem to guarantee fairness. It's always per-connection instead of per-customer-IP.

My ISP for example seems to classify traffic and prioritise based that (HTTP(s) ports get more bandwidth than others up to the first couple of MB, BitTorrent goes in a low-priority group, etc). Yet I can still eat up all the bandwidth I want by just using multiple connections.

I would think it would be even easier to do this on the customer-IP level? Average over some time span, and customers who haven't used their fair allotment of the bandwidth for that time period get priority over others, and the guy with 2000 bittorrent connections has the same claim to the bandwidth as grandma loading her online banking in the browser through one TCP stream.

Are there some issues I'm missing that make this harder than it seems?