Min/Max Refresh and Notify
kcd at daimlerchrysler.com
Fri Dec 13 17:18:05 UTC 2002
Mike Diggins wrote:
>I have a slave name server configured with a zone using min and max
What do you mean by "min and max refresh time"? There is only one
REFRESH field in an SOA record.
>I was using it to limit the number of times the zone updates
>to just two times a day.
>Question: If the master name server is configured to send notifies to the
>slave when an update to the zone occurs, will the slave update the zone
>anyway? That appears to be what's happening but I want to be sure. If it
>is true, would turning off notifies to that slave for that one zone stop
>that from happening?
Yes, you could turn off NOTIFYs and that would greatly reduce the number
of refresh checks that the slave performs. But, be aware that the
frequency with which BIND slaves perform refresh checks has a random
element to it. This is done deliberately to prevent slave "cycling"
which causes spikes of refresh-check and/or zone-transfer activity. So
you can never *exactly* control when the slave will perform
refresh-checks when you rely on the REFRESH setting alone.
Perhaps you might consider turning off NOTIFYs to the slave within BIND
and then using an artificial non-BIND method of sending NOTIFYs to the
slave at specific intervals. I seem to recall there was a utility out
there that could generate NOTIFYs, but I don't have a pointer to it
handy. Perhaps someone else on the list could provide that information...
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