[NTLUG:Discuss] "Back up dns server"?

[brian at pongonova.net]

On Tue, Dec 04, 2007 at 09:28:31PM +0000, m m wrote:
>  
> so, if I go http://www.foobar.com or http://foobar.com, where does it goes? ns1 or ns2?

It's up to the resolver library that's doing the resolving.  Some
libraries choose the first of the list. Others may do something
different.  DNS operators should not attempt to predict how a particular
resolver will determine which server gets which queries.  
 
FWIW, bind will rotate the order in which authoritative nameservers are
sent in an NS query.  For instance, do several "dig" calls on
www.example.com, and watch how the order of the servers in the authority
section changes.

  --Brian