If you take a look at your wireless router , you may see the abbreviations LAN and WAN, which are often next to some of the ports on the device. LAN stands for local area network, and WAN stands for ...
When you have two "NAT routers". Whether double NAT or not. wall--RJ11--router-modem(RM)---LAN-WAN--router(R)----LAN--comps (A Router-Modem(RM) so no WAN port, And a router R which has a WAN port, and ...