I'm migrating to a new DNS resolver - it has some features I'd like but less guaranteed reliability. My current plan is to have DHCP supply both in preferred order. RFC 2132 states "Servers SHOULD be listed in order of preference". In the past every time I've listed a fallback it's also been an anycast server.
Are there any devices that are known to not respect this ordering?
Should I just list my preferred server and work on improving predicted reliability (thus making this concern moot)?
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