True DNS Backup

[D. Stussy]

"Chris Buxton" <cbuxton at menandmice.com> wrote in message
news:fplp2q$2o8j$1 at sf1.isc.org...
> On Feb 21, 2008, at 9:58 PM, Gregory Hicks wrote:
> > If either network provider fails, but the other remains up, the
> > external world will continue to query your servers providing the
> > network does what it is supposed to do and provides routes TO your
> > servers.  They will try one then the other server.  Whichever one
> > provides the 'fastest' (relatively) response time is the one that is
> > actually going to get queried.
>
>
> One point I would add is, all zones must be delegated to all four IP
> addresses for this to work. That generally means giving each name
> server, in this case, two different names, one for each address.

Why?  Why can't one have two names that each have two address records?

There should be another server (in another geographic location) as both of
these are on the same local network (regardless of which address is used to
reach them).