[dns-operations] difference between several NS with several glue

[han feng]

> 
> Either way, there's at least one circumstance where one of the commonly used resolvers gives up, whereas it wouldn't in the traditional ns1/ns2/ns3 configuration.
> 
>From recursive name server perspective,  whether auth name server returns SERVFAIL  or timeout is no difference, recursive 
name server should try all the other name servers with different ip address. 


> -- 
> Dave Warren
> http://www.hireahit.com/
> http://ca.linkedin.com/in/davejwarren
> 
> 
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