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<div>> I suggest: In absence of an explicit TTL and a $TTL directive, the SOA</div>
<div>> Minimum from the policy is used (Zone/SOA/TTL).</div>
<div>> If the SOA Minimum is not defined in the policy, then use the zone's</div>
<div>> SOA Minumum field value.</div>
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<div>+1</div>
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<div>> Furthermore, make the policy statement (Zone/SOA/TTL) optional.</div>
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<div>Isn't it needed for the timing of the key rollovers?</div>
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<div>Ingc = min(TTLsoa, SOAmin)</div>
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