A mainly PC (some Mac) site w/Software, Computer Repair Info, How-To's on Using Computers
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Borrowed knowledge: DHCP passthru on Netgear WGR614 (This may be applicable to other routers). Set up your other DHCP servers range of addresses say 192.168.1.2-xxx.30, now set the routers IP as an address outside that range. Say, 192.168.1.50 Turn off the routers DHCP. Plug your other router into a LAN port NOT the uplink port.
borrowed from here