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What was theoretically feasible has been practically tested : "BIND used fully randomized source port range, i.e. around 64000 ports. Two attacking servers, connected to the attacked one via GigE link, were used, each one attacked 1-2 ports with full ID range. Usually attacking server is able to send about 40-50 thousands fake replies before remote server returns the correct one, so if port was matched probability of the successful poisoning is more than 60%. Attack took about half of the day, i.e. a bit less than 10 hours."

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