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domain name server

Q. How do I verify that my ISP or my own recursive resolvers are free from DNS cache poisoning bug that is promised full disclosure of the flaw by Dan on August 7 at the Black Hat conference? How do I test my dns server for DNS cache pollution or DNS Cache Poisoning bug?
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Q. I've 3 corporate domains registered with Go Daddy. Recently we setup our own nameserver using BIND9 under Linux. My setup is as follows:
example.com domain
ns1.example.com 202.5.1.23
ns2.example.com 202.5.1.24
ns3.example.com 202.5.1.25

However, when I try to change nameserver using Go Daddy domain control panel, I get an error that read as follows:

Errors were detected.

How do I configure my server to avoid errors?
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Q. I'm not able to run nslookup or host command under Debian or Ubuntu Linux. In fact, these commands are missing from my installation. How do I install nslookup and related dns client commands?
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