Issues resolving outlook.office365.com

[Thomas Sturm]

> If you're running bind 9.10, then bind 9.10 doing prefetch is a normal use-case.
> 
> You make a good point that a prefetch-enabled resolver might show different behaviour to a non-prefetch one. But we've been on prefetch-enabled resolvers for the whole length of our o365 rollout IIRC, so I have no data to compare to.


I was also looking into the prefetch thing:

- with "prefetch 0” I am able to reproduce it every single time the TTL expires, even on quiet dev hosts
- with “prefetch 2” I am able to reproduce it on loaded hosts only
- with “prefetch 10” I am NOT able to reproduce it at all


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