On 2016-07-31 18:00, Carl Byington wrote:
Which customers will complain?
Consider the case where you have customer A and ex-customer B, and you
still have ex-customer B zones loaded in your master dns servers. The
rest of the world properly sees the (new) zone content for ex-customer
B.
But when your existing customer A tries to send mail to ex-customer B,
it may go to the wrong place or bounce. And that will only happen for
your *other* customers. B thinks everything is ok, since they can
receive mail from gmail, etc.
To properly serve your customers like A, you need to purge B's zones
soon after they move, whether they notify you or not.
Or, separate your resolver and authoritative roles, in which case this
won't be an issue. One should still monitor for zones for customers who
have departed, obviously, but it's not likely to cause any operational
issues.
--
Dave Warren
http://www.hireahit.com/
http://ca.linkedin.com/in/davejwarren
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