Specify next hop on a DD-wrt router

I’m trying to setup a second subnet that will have internet access and be accessible from the outside via RDP.

I have the following:

Cable modem >>>>>> Linksys E1500 >>>>>>>>>>>>>>>>>>>>>>> WAN port of  WRT-54G
            DD-WRT (Sp2)                           DD-wrt (V24-SP1)
            192.168.1.1                          192.168.2.1

If I leave the WRT-54G set to Gateway mode I can get to the internet but nothing from outside (RDP) can get in.  I changed the mode to router on the WRT and set it to a fixed IP:

WAN IP      192.168.1.2
Subnet      255.255.255.0
Gateway      192.168.1.1
DNS      192.168.1.1

Dropped the firewall on both routers.  What I don’t understand is how to specify the next hop for the WRT-54G.  I can’t get on the net in router mode only Gateway mode.  I can’t ping 192.168.1.1 from 192.168.2.144 (just some workstation).

In the E1500 I have created a route that looks like:

Destination LAN Net        192.168.2.0
Subnet mask        255.255.255.0
Gateway              192.168.1.2


I’ve tried to follow the instructions in http://www.dd-wrt.com/wiki/index.php/Linking_Subnets_with_Static_Routes but just can’t get communication with the WRT-54G in router mode.

So the question:  How do I tell 192.168.2.1 to use 192.168.1.1 as its next hop?