Don't misunderstand what I'm saying. I know you need the Netgear to host, I have a DLINK too (it no worky for hosting). I'm trying to understand how you have the DLINK connected?

Is your WAN port on the DLINK connected to a LAN port on the Netgear?

If it is, you don't need to do that, that's all.

It's simpler to join the two firewalls together via a crossover cable (basically using the DLINK as expansion switch ports and as a wireless bridge).

Double NATing will work, but it's a "department of redundancy depart" kinda thing in my view.

Now wireless devices may not cooperate with the Netgears DHCP, as always it "depends". More fun.