Configuration of a drop-in bridged CISCO Router / Firewall
NAT - RouterOS - MikroTik Documentation
Gee.is/blogging — Double NAT explained and possible solutions
linux - How to get WAN IP of a router on double NAT (not a public IP)? - Unix & Linux Stack Exchange
AT&T Fiber] TP-Link AX11000 Router Double NAT Situation [Solved - IP Passthrough on Main Router, Bridge Mode on Modem]] - Port Forwarding Resources - Roon Labs Community