How bind select NS record during recursive queries

Tony Finch dot at
Thu Nov 19 13:38:02 UTC 2020

Duleep Thilakarathne <dchandimal at> wrote:
> How does bind select NS entry during recursive queries  , when the answer
> section has multiple NS entries.

It's roughly based on measuring the smoothed round trip time (SRTT) to
each nameserver and picking the closest, with a lot of randomness in the
mix. Try searchengineering [BIND SRTT] for lots of discussion of the

f.anthony.n.finch  <dot at>
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