In Mac OS X v10.6 and later, the search order of DNS servers specificed in Network preferences is dynamic, so that servers that don’t respond are moved to the end of the search order.  This provides performance and reliability improvements over previous Mac OS X versions, but it can lead to unexpected results where a strict search order is required in Mac OS X v10.6.
With Mac OS X v10.6.3 and later, DNS servers can be searched in a strict order by making a change to the mDNSResponder plist as an administrator. Learn how in this advanced article.

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