<div dir="ltr">Mea Culpa. Apparently RPZ IS the issue here.<div><br></div><div>I learn something new every time I read this list. </div><div><br></div><div>My apologies for the waste of bandwidth.</div><div><br></div><div>Bob</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jan 16, 2023 at 9:02 AM Bob McDonald <<a href="mailto:bmcdonaldjr@gmail.com">bmcdonaldjr@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">This is just conjecture but I'll take a stab at this problem.<div><br></div><div>First, the fact that the zone is RPZ really doesn't have any bearing on this problem.</div><div><br></div><div>Do you control both the primary and secondary zones?</div><div><br></div><div>Please provide the SOA for the zone. This will allow the list to see some key timer values.</div><div><br></div><div>1) Updates are applied to the primary zone which triggers a notify to the secondary zone and a resulting incremental zone transfer. (IXFR)</div><div><br></div><div>2) Before the IXFR from item 1 is finished, the refresh timer expires triggering the secondary zone to request the SOA from the primary. Since the serial number on the secondary has not yet been updated as a result of the IXFR from item 1, the secondary requests ANOTHER IXFR from the primary. This can cause the overlap you are seeing.</div><div><br></div><div>The following suggestions for possible workarounds depend on you having control of both primary and secondary zones.</div><div><br></div><div>There are a couple of things that could help. the refresh timer for properly configured dynamically updatable zone sets needs to be set fairly high. I like 8 hours. YMMV.</div><div><br></div><div>The updates to the primary zone can be effectively batched using the notify-delay value. This will require some further thought and testing. The ultimate value depends on the volume of updates being generated.</div><div><br></div><div>Hope that helps,</div><div><br></div><div>Bob</div></div>
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