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There are many other single points of failure besides network failure, such as pushing the wrong configuration. In fact it seems to me that it would be rather rare for a multi-homed datacenter to have a network failure.



If you have a routing issue, whether it is due to "corruption" or misconfiguration, having some of your name servers on an entirely different network (i.e. a different AS) with a different routing policy is not going to be affected.

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