default local DNS caching name server

[Bruno Wolff III]

On Sat, Apr 12, 2014 at 09:38:03 -0400,
   Chuck Anderson <cra at WPI.EDU> wrote:
>
>You cannot rely on DNS2 and DNS3 to be queried UNLESS DNS1=127.0.0.1
>fails to respond.  This might be a way to mitigate failure of the
>local caching resolver process, but it is not a way to ensure the
>ability to resolve internal names from the corporate nameserver.  The
>way to ensure the latter is to configure the local caching resolver to
>forward to the DHCP-provided nameservers rather than becoming a full
>iterative resolver.

If they do spilt horizon DNS using a zone that can be found normally, things 
will still work. If they use zones that can't be found that way, then you 
can make an exception for that zone, but still use iteration for other 
stuff.