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

[brian at pongonova.net]

On Tue, Dec 04, 2007 at 07:49:53PM +0000, m m wrote:
> All:
>  
> We all know that we need to have two DNS server for a domain.Usually, these two DNS server have the same A records for a domain.All of this settings are preventing the web site (mail...) failure.  
>  
> Based on the concept above, I think we should be able to set the 2nd DNS server to a different IP with same domain name as primary DNS server.

You'll want to give your nameservers different hostnames:

ns1.foobar.com
ns2.foobar.com

This takes advantage of the resolver library's ability to select from
a "round robin" of choices.  What you are trying to do directly
competes with the redundancy already built into DNS resolution.

  --Brian