two NS servers on a single host

Sam Wilson Sam.Wilson at ed.ac.uk
Wed May 13 14:27:53 UTC 2009


In article <guel1o$2dsk$1 at sf1.isc.org>,
 Bradley Giesbrecht <brad at pixilla.com> wrote:

> 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.

But a in that case you would include one NS record for a host with two A 
records.  Check the NS records for my own domain for an example.

Sam



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