DNS cache poisoning

[John Bob]

Hello.

I am making a study of DNS security, so I would like to know DNS cache 
poisoning in detail.

Could you recommand website and programs related to it?

I heard there are opening DNS cache poisoning programs, but I can not 
find those on the Internet.

I would like to test DNS cache poisoning for only study and improve DNS 
sceurity on my name servers..

Thanks.

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John Bob / meldin at naver.com