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 ...
I use a simple unmanaged switch to expand my wired Ethernet access without complicating my home network.
With each passing year, hardware devices grow less dependent on proprietary components and more reliant on open source technologies. Network routers are among the main beneficiaries of this trend, ...