I have! BIND 9.11.x, as pairs of caching recursive resolvers advertised over BGP. We have a pair in every data center (12 dcs at last count) Each with one of two IPs (anycasting). Every time I get hit up for a “problem” with this it turns out the problem is with an authoritative AD server. I really love it as it’s been in place for almost four years and it has never been the source of any problems.
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