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A BIND hidden primary should transfer zones only to two secondary servers and notify them after updates. Which controls belong in the zone or server config?
recursion yes for the Internet so secondaries can discover the zone
allow-query none on the authoritative zone so transfers are safer
allow-transfer limited to the secondaries, also-notify as needed, and TSIG where appropriate
A cron job that scp copies zone files instead of AXFR or IXFR
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