@rajil.s
Thanks for your quick response. Here is the setup I have.
Asus RT-AC59U which supports Dual Wan - I got minimal plans from Airtel and ACT and configured them on Load Balance Mode.
The issue is that the ASUS
router does not detect a WAN failure, As long as the
Nokia Modem is online. (I need to login to asus config page and manually disable Airtel Wan, When it goes down)
It detects failures on ACT circuit as they give RJ45 cable which directly connects to the ASUS router.
Looks like only a
GPON router with Bridge mode can resolve this.