[dns-operations] co-operative cacheing

[Tony Finch]

My email servers each have a local DNS cache + recursive resolver, to
simplify administration and spread the load. The disadvantage is that one
server might spend ages doing a full recursive lookup when another one
already has the answer. It would be nice if a server could reduce latency
by asking the other members of a cluster if they already have an answer.
Something like the co-operative cacheing that was implemented for HTTP.
Has anyone done this?

Tony.
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