Using the TTL, we figured out that the censor kicks in at the kth hop. This kth box belonged to Airtel. If a box was censoring after Airtel, we would have rece

Using the TTL, we figured out that the censor kicks in at the kth hop. This kth box belonged to Airtel. If a box was censoring after Airtel, we would have received a clean response (ICMP timeout) at hop k as well. Of course, the TTL itself can change during the run, but that wouldn't happen for so many cases :)