Axel Hammerschmidt <hlexa@hotmail.com> wrote:

> If they are smart enough, they can find out what MAC addresses other
> users equipment have and "borrow" one of these.

At which point the OP could put limits on all devices and announce that
this had been done to preserve some measure of service for all users.
This might encourage the other residents of the house to evict the two
P2P fiends.