getting not authoritative with some notifies - Solved
Matus UHLAR - fantomas
uhlar at fantomas.sk
Mon Aug 1 08:26:37 UTC 2016
>On Sat, 2016-07-30 at 21:40 +0200, Matus UHLAR - fantomas wrote:
>> or simply wait till customers complain and tell them they should tell
>> you when tthey migrated their zones off.
On 31.07.16 18:00, Carl Byington wrote:
>Which customers will complain?
funny that you have answered below.
>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
>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.
both customer A and ex-customer B will complain because of mail doesn't
Happened multiple times.
>To properly serve your customers like A, you need to purge B's zones
>soon after they move, whether they notify you or not.
that's the whole problem - we have to watch and notify.
Separating authoritative and recursive DNS works much better.
we can put different measures on protecting each of those.
Matus UHLAR - fantomas, uhlar at fantomas.sk ; http://www.fantomas.sk/
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