@Kevin_Z 1. The isp has registered the mac address of my new device (tp link router) else the net would not work. That is when the problem starts ( site not opening on any device while ping working...

@Kevin_Z Thnx for the suggestion. It worked. The problem did not occur during the last 1 month. But now on revert to the default mac address the problem started occuring. Noticed a peculiar thing....

I have been using the router on 4G-LTE SIM. It was working fine. Recently subscribed a broadband connection to increase the throughput. The service provider provided copper cable (cat5/7) with static...