Bypass double NAT on Airtel Fiber with near-gigabit speeds (~800 Mbps) using a manual bridge on the Digisol DG-GR6011 ONT. No firmware modification required — all changes are runtime + persistent storage scripts.
Airtel provides their own locked-down ONT (typically Nokia or ZTE) which runs TR-069 for remote management, giving the ISP full control over your device. You can't disable NAT, can't use bridge mode properly, and can't stop the ISP from pushing config changes to your equipment.
The Digisol DG-GR6011 is a third-party GPON ONT popular among tinkerers in India as a replacement for the ISP-provided device. By cloning your GPON serial number onto the DG-GR6011, you get: