That’s the IP address when the old router is plugged in. Nothing shows up but fec0.0101:0:0:ffff:1%1 when the c9 is plugged in.

Windows 10. Under network settings “IP Settings“ IP assignment:” is set to “automatic (DHCP)”.

My current router is an Archer C8 with a wired ethernet connection to my PC. The modem is a Xfinity Gateway (coaxial cable). I purchased a new C9 and followed the set up instructions. Everything...