The open recursive DNS servers, are real DNS servers, with caching and backoff logic. If, say, there are 94k [1] open DNS resolvers in the wild, each will ask you one DNS question for example.com, cache the answer and that's it.
The big volume for the "fixed domain" queries indicates proper BCP-38 spoofing.
The open recursive DNS servers, are real DNS servers, with caching and backoff logic. If, say, there are 94k [1] open DNS resolvers in the wild, each will ask you one DNS question for example.com, cache the answer and that's it.
The big volume for the "fixed domain" queries indicates proper BCP-38 spoofing.
[1] http://public-dns.tk/