Using an ADSL modem/router as modem only

I have a D-Link DSL-2520U ADSL modem router and a Netgear WNDR3700v2 router. I want to use the DSL-2520U as ADSL modem only, and the WNDR3700 for NAT, firewall, DHCP and wireless access.

How I should setup the DSL-2520U to act as modem only? In particular, I don't understand the ADSL configuration required.

Details

The DSL-2520U is an ADSL modem router, with a single etheet port and no wireless capability. It does have NAT, firewall, DHCP, and more things that I dont' need. For reference, I've put its help pages here and here.

I have OpenWRT installed on the Netgear WNDR3700 router. In my current setup, the DSL-2520U does NAT and firewall. The Netgear router has its firewall and NAT disabled (to avoid double-NAT). It does wireless and DHCP.

I want to change this setup such that the DSL-2520U only acts as the ADSL modem. I want the Netgear router to take over the NAT and firewall responsibilities, so that it can then be setup with pretty-much the default OpenWRT configuration. In addition, I still want to be able to access the DSL-2520U admin page.

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