How do ISPs sever internet services on non-payment of bills?

Subhom Mitra August 4, 2012
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Recently I defaulted on my by internet bill and my internet connectivity was severed. Actually, the connection was active, but whenever I tried to open any website, I was redirected to this one: ” http://www.freetrial.bsnl.co.in/ ” telling me that I hadn’t cleared my bill. Once I paid it, the services resumed automatically. I was just wondering how my ISP (BSNL) was redirecting me to that site everytime. Was it DNS hijacking or maybe tracking my router’s MAC address to identify me? And how was it that once I cleared my dues, I was no longer being redirected? This question is purely academic curiosity!

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