We just tried changing our dhcp option from our existing .world domain suffice to one that matches our internet .com suffix. We let that propagate for over an hour. The windows looked good, but when we started checking mac and linux based systems is where we started to see problems. After a reboot, those boxes picked up the new .com domain suffix but couldn't ping anything that still had a .world suffix. I am guessing that this has something to do with domain search order, but I am not sure as I am not a DNS expert in the slightest.
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