Newbie question, apologies in advance :^/

I have a CPE210 as a central access point on a backbone.  It connects with several remote locations.

Each remote location is another CPE210 that fronts an independent subnet.  I want to have routing

between each remote subnet and the backbone subnet, not bridging. 

How can I configure the remote CPE's to perform routing, without NAT?

AP Client Router mode seems appropriate; it's got "router" in the name :^) but that's not working.

I found the "DMZ" option but that gets me to only one host in each subnet.

There's also port forwarding but that's cumbersome and a pain to setup for each app that I use and every new host added blah blah...

My crude drawing:

Thanx!

-- Steve