You won't be able to hit the external NAT address from an inside NAT interface. I am doing something similar, and the way we got around it was to use a separate internal DNS server with zones that point to the internal server IP addresses.
Another option would be to put the servers in the DMZ...
I am having similar problems with my Cisco 2600 series router connecting to an Efficient Networks DSL router. Did you ever find a resolution to this problem (incomplete ARPs)?
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