I have configured my
Asus Router mesh system this way:
Jio gateway has IP 192.168.29.1
Asus router is in
router mode with IP 192.168.1.1
Asus router has IPv6 firewall disabled and IPv6 set to passthrough mode.
You will be triple-NATed on IPv4 but your devices will receive public IPv6. You have to add that public IPv6 into Jio gateway's IPv6 firewall exceptions list to get access to your LAN devices from outside.
But your router will be in FULL router mode and not be a dumb access point. So mesh can be set up as long as it is not just an access point.
Both Asus and Jio gateway are accessible from browser page by typing their respective IP addresses. Double port forwarding also works on IPv4 to access CCTV cameras on IPv4. Everything just works.
Positives: Jio doesn't see any of your LAN devices. Triple NAT issue will not make existing double NAT issue any worse. I can connect to
Xbox live and play Forza
Horizon 5 online.
PS: Notice I don't talk about Bridge mode anywhere because it's not possible on Jio and never will. Or switch to
Tata Play or Airtel who allow bridge mode. But with CG-NAT, I don't see much of an advantage with that as well.