I didn't read about it. I'm an IT professional. The thing is, I need everything in the same firewall zone.
On my main router, the internet of course is separate, so turn on NAT there. Currently though, my other 2 routers also have NAT enabled, and I have to have different IP address ranges for each segment in my own LAN. That's the part I need to get rid of - 3 separate routers, to 3 different LAN segments. My office in the garage needs to be on the same subnet as the main router, and likewise with the OpenWRT Wireless repeater in the front of the house - all need to be in the same network. So far, all attempts to do this have failed!