In the summer of 2008, security researcher Dan Kaminsky discovered new techniques that allow DNS caches to be poisoned much more easily than had previously believed possible. His discovery led to a coordinated effort on the part of many DNS vendors to implement source port randomization in order to combat this new cache poisoning technique. However, source port randomization, by itself, only makes it more difficult for attackers to succeed in poisoning a cache.
This whitepaper discusses the five layer defense model employed to Secure64 DNS Cache that provides industry-leading protection against cache poisoning attacks.
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