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Originally Posted by lordy
I guess, I thought it would depend on how often the external DNS server is configured to update, as some seem to take longer to sync with Root servers than others. That's all I was getting at.
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DNS servers are not configured to update - every dns record has an expiry time (TTL) associated with it, and the dns server will update the record the first time it is asked for it after the expiry period has passed. Typical TTL's can be anything from 2 hours to 2 days.