Need to understand NAT modes on a Cisco 678

[ErnieE]

I am trying to setup a Cisco 678 with a D-Link firewall behind it so that my client can use the D-Link for doing all his firewall configurations. The Cisco is running the most recent DMT image. The Cisco is setup as a DHCP client on the outside and DHCP server is disabled on the inside. I would like to bridge all the traffic to the D-Link. I thought that disabling NAT would get me their but that is has not worked. Does anyone have any suggestions on how to accomplish this or at least what the Cisco is doing with NAT disabled?

Thanks in advance