Question about expected recursive resolver behavior
srn at prgmr.com
Thu Apr 23 19:16:57 UTC 2020
What should happen when for a given domain:
- The domain resolves via TCP but not UDP - UDP for this domain had no response at all.
- That authoritative nameserver hosts other domains, and those domains resolve via UDP.
I found https://www.isc.org/blogs/refinements-to-edns-fallback-behavior-can-cause-different-outcomes-in-recursive-servers/
but I'm not sure if this case is covered or not.
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