two NS servers on a single host

[Jeff Lightner]

It is network redundancy only in so far the DOS attack doesn't cause
your CPU and memory to get slammed.   

If you're doing redundancy you really ought to do the whole thing by
getting another server and putting IT on the other network.   Then you
don't have a single point of failure (unless they're both in the same
data center).

If you really want to do two different IPs on one host you could
probably use views to accomplish this but that would be all within a
single BIND setup so your theoretical DOS attack would probably cause
both views to have issues.

-----Original Message-----
From: bind-users-bounces at lists.isc.org
[mailto:bind-users-bounces at lists.isc.org] On Behalf Of Bradley
Giesbrecht
Sent: Wednesday, May 13, 2009 10:22 AM
To: Stephane Bortzmeyer
Cc: bind-users at lists.isc.org
Subject: Re: two NS servers on a single host


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
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