Hotspot only DHCPed IPs

I have a network with a good number of routes behind a DHCP server, on on the subnet that I am running on I have a large number of DHCP clients. I also have behind other routers on that same network, they are doing PPPoE, as well as I have PPPoE going into this same MT.

The quesiton is, can I setup the Hotspot to be JUST for people form this DHCP IP Subnet. That way they have to login?

Dennis