[c-nsp] Cache DNS servers

[Roland Dobbins]

On 2 Dec 2015, at 10:02, Nathan Ward wrote:

> I have tested similar topologies in anger and haven’t found that the 
> benefit (which is fairly small) is worth it for the added complexity.

One benefit is that if there's need to block/alter a particular response 
(say, for a botnet C&C), there's a centralized place to do it.

Logical functional bulkheading is also quite useful from an availability 
perspective.

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Roland Dobbins <rdobbins at arbor.net>