Cloud DNS providers for secondary DNS

Chris Buxton clists at
Wed Dec 30 17:54:39 UTC 2015

> On Dec 29, 2015, at 5:36 PM, Michelangelo De Simone <michel at> wrote:
> also, in order to avoid
> unecessary polling, you may think of enabling the "notify" options from
> your master toward your slaves.

No, that's not what that does.

The notify mechanism is enabled by default, although it probably needs some tweaking using also-notify in an anycast scenario.

The notify mechanism allows the master server to notify slave servers (or other hosts) when a zone changes. This speeds up the synchronization process between master and slaves, but does not preclude the regular scheduled SOA queries.

If for some reason you were concerned about zone refresh traffic (typically 1 query per zone every several hours), you can tune it in a few ways, including adjusting your refresh timer upward to, say, a day or even two. This is safer to do when you know that the notify mechanism is working properly. Is that perhaps what you meant?


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