DHCP Static IP, dns and gateway per client

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http://www.linuxquestions.org – Hi, Looking forward to your feedback. I have set up a community wifi network with approximately 100 homes connected to access points on a tower. What we would like to do is connect several DSL internet gateways to our WIFI network. We would like to route traffic from users smartphone, tablet, laptop connected to the WIFI network through their own gateway at home. Without sharing it with other people. The only thing I can think of to accomplish this is to use dhcp.conf and statically assign an IP address, dns and gateway to a mobile device via is mac address; but I am not sure how the config (HowTos)