> Most of the times, when you make a DNS change, it may take up 24 hours
> to replicate to all other servers.
> And during that time is when, you wonder if it's gonna work or not. On
> top of that your carrier may not refresh it's list every 6 to 12 hours.
> I had to talk to a supervisor to have AT&T do the refresh it right away.

If you know in advance that you'll be changing, you can adjust the
expiration times in the zone so that servers around the net won't cache
the old IP for very long.  This greatly facilitates convergence on the new
IP.  Don't forget to change it back to avoid unnecessary traffic.


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