two NS servers on a single host

[Bradley Giesbrecht]

On May 13, 2009, at 6:51 AM, Stephane Bortzmeyer wrote:

> On Wed, May 13, 2009 at 09:02:55PM +0800,
> Tech W. <techwww at yahoo.com.cn> wrote
> a message of 34 lines which said:
>
>> I want to give two NS records for my domain, each NS take each of
>> the IP set in the host.
>
> Why? This would be completely useless. RFC 1034 and other documents
> call for at least two name servers, for redundancy reasons. If the two
> name servers are on the same host, what's the point? There would be no
> gain in reliability.

If you have ever had the ip for your name server the target of a dos  
attack you could have blocked traffic to that ip and still had dns.

Two networks to same host is network redundancy and has value.


//Brad