New DNS functionality in patch 9.

In this new firmware update, we have external mappings. For example, if there are two xroads units, 1 up and 1 in failover, both will have external mappings to one another for instances of round robin DNS. Example: ns1, ns2 point to one box, ns3 points to another. If the first box is up and the second one is in failover, and a client tries to browse to xyz.com and gets the ns3, it will go to the failover box. However, now with the external feature, the client will be redirected to the box that is up and running, box one.