> On 11 Nov 2021, at 15:28, Christian Huitema <[email protected]> wrote:
>
> It is not uncommon to see upgrades being rolled out at different times to
> different servers in the farm. Opportunistic strategies and probing
> strategies have to deal with that.
This can be complex. Lots of busy domain names (like TLDs) use a combination of
DNS servers that are managed and operated by different organisations using
different flavours of softwware for the obvious SPoF reasons. Which means
upgrades can be like changing a plane's engines in mid-flight. For instance,
look at how long it took for all 12 RSOs to be in a position to support DNSSEC
and IPv6.
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