I don't think you have a problem with the NAT thing (since you aren't really using it). I believe you have a routing problem

I'm inclined to agree with you. You can't really not configure nat..you *have to* use it on some level, as I understand it...even if you're using it to tranlsate an address back to itself (or what they call identity NAT). We've spent a lot of time looking at the nat command, but I'm not sure anymore that it's where my problem lies.

I kept thinking about the route command and maybe a misconfiguration there, but that seems pretty straightforward.

Have you configured it with RIP, OSPF, EGRP or something like it?

Yeah..I did try enabling both RIP and EGRP on the device at various times (though not concurrent) to see if that would help move things along, but to no avail.

I'm sure I'm getting closer, and probably still yet missing something obvious that I'm going to slap myself for later.