In reply to a post by zzing123:

Which ISP are you on? This smells like CG-NAT to me. It won't be the ONT that's doing any routing, but a router between the exchange the Internet proper responsible for this NAT routing. You ought to confirm by doing a traceroute.

However, despite CGNAT, you should still have full internet access, and the only thing that would affect you would be the fact the Google Wifi wouldn't be able to have an open port on the Internet, which it shouldn't have anyway.