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R042 NAT Question

All:

We have a rather intricate network setup at our office. We now have two ISPs AT&T using a Netopia (this was our original ISP) and a Comcast business connection. We have purchased the Cisco/Linksys R042 to use both WAN connections to boost our speeds. Our original setup included the Netopia (AT&T) feeding a SonicWall Firewall/VPN into the switches that distribute the connection. I had setup a FQDN to point to the fixed IP address for our Netopia, and set up an IPMap in the netopia to NAT the connection from the fixed AT&T IP to the "external" IP of our sonic wall device. Now we have interposed the Cisco R042 device between the Netopia and the SonicWall. I need to figure out how to set the NAT on the Cisco to pass through the "pass through" from teh Netopia into the SonicWall.

I tried setting the NAT to:

the output of the AT&T IP --> the external ip of the SonicWall (similiar to the IPMap on the Netopia)

Then I tried

AT&T external IP -->  the external ip of the SonicWall (similiar to the IPMap on the Netopia)

No go on either.

Anyone have any ideas?

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