This behaviour may be encountered due to the introduction of automatic
empty zones for RFC 1918 prefixes if you are using IP addresses within
the RFC 1918 private address space.
provides a number of empty zones that are automatically configured and
loaded (for each view) when named starts. The purpose of these zones is
to prevent recursive servers from sending meaningless queries to
Internet servers that cannot handle them (thus creating delays and
SERVFAIL responses to clients who query for them). These empty zones
ensure that immediate and authoritative NXDOMAIN responses are returned
All empty zones that named loads automatically are logged as they are created and loaded when named starts up, or you can refer to the list in the Administrator Reference Manual (available in the BIND distributed source code and online at: http://www.isc.org/software/bind/documentation
The configuration option empty-zones-enable controls whether or not empty zones are created, whilst the option disable-empty-zone can be used in addition to disable one or more empty zones from the list of default prefixes that would be used.
For a view that has recursion enabled, the default is "empty-zones-enable yes;"
For a view that has recursion disabled, the default is "empty-zones-enable no;"
For a longer and more detailed article on the implementation of automatic empty zones, see: Automatic empty zones (including RFC 1918 empty zones) (you will need to login to view this article, but registration is open to all).
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