You may already know that starting 1st of October 2015, BSNL will automatically upgrade your internet connection speed from 512 kbps to minimum 2 Mbps, until you exceed your Fair Usage Policy (FUP) limit. Once you have exceeded your FUP limit, BSNL will start redirecting almost all domains (except Google, Gmail etc.) in your web browser to an IP address which will show you following message:
Dear customer since you have exceeded the fair usage limit provided as per your opted plan. You will be able to browse with the reduced speed from now on. However you can browse at the higher speed by appropriately adding/upgrading a voucher.