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  • Assuming you've got the ClearOS box set up as a gateway, which I think you must have from what you said, the modem can have any size address range and it will only supply the single IP you need to connect all your devices on the LAN side to the Internet. The only requirement is that it is a different subnet from the LAN ports.

    I would also try turning off DMZ as that is normally for a web server.

    Your Clearos box on the 2 LAN ports should each have a static IP address defined and DHCP enabled with an address range to give out to the clients.

    Perhaps try setting up one on the LAN segments first and getting that working, then add the second?

    Hope that helps :)