Router to Router Network

Right, so i'm having some problems here.. Was wondering if anyone could shed some light on this issue. I have a Gigafast EE400-RP (NAT router) and a Belkin Wireless router (802.11b).

I have 2 locations of my house the have computers in them, the basement, and the 3rd floor. Our cable line comes in on the 3rd floor, into the cable modem.

I'll explain the way I have it set up now, and the problems I'm having, then if anyone has suggestions, lets hear them =P

Cable Modem --> Belkin Wireless Router -->
1) Comp 1,
2) Comp 2,
3) Gigafast Router -->
1) Laptop
2) Main comp
3) Server.

The setup so far is, Belkin = 192.168.2.1, Gives IPs of 2.2-100, all the computers on the 3rd floor grab the connection, and so does the gigafast router. The gigafast router then spits out the connection to the comps in the basement, who all get internet. The problem is, I can't get ports forwarded through to my server (behind two routers). And I can't tell if it even makes it past the first router, or where the request gets killed.
I have tried all combinations of: DMZ or port forwarding on the first (either the Gigafast's IP in the DMZ, or forwarding the ports i want to the Gigafast), and then having the Gigafast either Port forward again to the server, or DMZ the server (i know, 2 DMZ's is unsafe, just trying to get something to work...)

Options:
Both routers allow Port Forwarding/DMZ...
The Belkin, you can turn off DHCP and NAT...
The Gigafast, you can only turn off DHCP...

Suggestions?

Your choices are limited due to the equipment you are using. You should be using a switch instead of the Gigafast router.

Possible solutions I see:

1. get two public ip addresses from your providers and a small switch. Connect the cable modem into the switch and connect the routers into the switch configuring each with one of the ips given.

2. set the belkin to dmz or bridging[turn off nat] only. This puts your 2 pcs at risk but firewall software should handle that. With the Gigafast router you can put the server in a dmz zone.

I have 2 Belikin routers and I just confiigured one to act as an Access point. This enables my main router to assign all IPs and the second router just acts like a wireless hub (then you don't require assigning a second set of IPs on your secondary router from an IP assigned by your primary router). I am not familiar with your other router but you may want to give this a try.

Have your non-Belkin router connect to the cable modem and assign IPs and set up your Belikin as an Access Point. This is explained on the Belkin site in the How-to section. You are setting up a wireless bridge.