TWC Motorola SBG6580 and Airport Extreme

So Time Warner came out and installed a Motorola SBG6580 in my home (Docsis 3.0) to allow me to receive their Wideband Internet offering (50 down / 5 up) but i'm having huge problem with how it fits into my network. 
I have an Airport Extreme and 2 Airport Expresses.  Now the main problem is the Motorola Cable Modem is both a modem and a router.  I want it to just act as a modem. 
I called  TWC and they told me to disable NAPT mode, which puts it into a state where it just acts as a modem.  Great, that sounds good.
I went ahead and did that but when I rebooted the whole network it only allowed 1 computer to connect.  None of my iPads or iPhones or Xbox could access the network anymore.  (My Airport is on Firmware 7.6).
Why is only 1 computer able to access the new network?  What am I missing? 

Arzenal wrote:
I went ahead and (disabled NAPT mode) but when I rebooted the whole network it only allowed 1 computer to connect.
That makes perfect sense.  There needs to be a router in provide "NAT" functionality to support a connection by more than one device.  You seem to have an AirPort Extreme but haven't mentioned trying to connect it directly to the TW device.  That's what you need to do.  Further, the Extreme needs to be configured to create a wireless network.

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