Router behind gateway modem with multiple devices connected to each

I just moved into a new place and the cable company supplied me with a motorola sbg6580 gateway and I have a netgear wnr3500l router with dd-wrt. because of location I have computers plugged into both devices (htpc and game consoles in the gateway, desktops in the netgear). my question is how would i configure the gateway and router so everything sits on a single network AND the netgear with dd-wrt handling all the heavy lifting (port forwarding mostly)

Thanks in advance
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More about router gateway modem multiple devices connected each
  1. for the netgear to take the load, it will need to become the gateway.

    the Motorola needs to be put into bridge mode, so it acts like a modem only and connects to the WAN/Internet port of the Netgear.

    you also need to add a switch where the Netgear currently is
  2. I too would do what Emerald suggested.

    For a wired solution:
    Internet > Motorola > Netgear > Switch > PC's, game console, htpc etc

    Make sure you have a switch that has enough ports to support all your devices +1 designated to connecting to the Netgear, and maybe even have some spare ports for expanding the network (optional but recommended). Also make sure the switch has gigabit ports.
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