Why Routers Automatically Shift From 192.168.1.1 to 10.0.0.1 or 192.168.2.1 (Understanding Subnet Collisions)

If you have ever plugged a brand-new Netgear, TP-Link, or ASUS Wi-Fi router into an existing ISP fiber ONT or cable modem, tried to open 192.168.1.1, and watched your browser fail to connect—or worse,