On 3 April 2017 at 07:55, Tony Finch <d...@dotat.at> wrote: > > If you expand ALIAS on the master server like this, I would expect that > most of the time the target addresses won't change very frequently, so the > IXFR rate should be much less than the ALIAS polling frequency. >
I believe that's a faulty assumption. Here's some data: One of our registrars has ~3.6 million zones hosted on its name servers. We have historically allowed end users to put CNAMEs wherever they want in the UI, but have a CNAME "emulator" in the publishing path replaces the illegal ones before they're inserted in a zone. During the month of February, the CNAME emulator initiated 872k changes to 28k zones, with an average of 31 changes per zone. The minimum/maximum changes per zone were 1 and 231 respectively. A change is updating one or more replaced CNAME records in a single action, so this doesn't count individual CNAMEs updated. It's also possible actual changes occurred on authoritative servers more often, since we avoid DoSing upsteam authoritatives. Here's the distribution of the number of zones per number of changes. I've used a LOG scale, since there's a spike of 10k zones with 42 changes, which makes a linear graph unreadable. <http://imgur.com/RzuHgks>
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