I'd like to understand this better. I don't understand what you mean by "steal DHCP connections." Do you mean they use up all of the available DHCP leases? Have

I'd like to understand this better. I don't understand what you mean by "steal DHCP connections." Do you mean they use up all of the available DHCP leases? Have you verified this assertion? I've never observed the behavior you're talking about, and frankly, I suspect that you're just attributing some network failure to a Mac user that just happens to be present.