Re: Question about expected recursive resolver behavior

2020-04-23 Thread Tony Finch
Sarah Newman wrote: > 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. I would expect the domain to be completely unresolvable: the resolver will only try TCP if it gets a truncated reaponse over UDP. > - T

Re: Question about expected recursive resolver behavior

2020-04-23 Thread Sarah Newman
On 4/23/20 12:41 PM, Chuck Aurora wrote: On 2020-04-23 14:16, Sarah Newman wrote: 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 vi

Re: Question about expected recursive resolver behavior

2020-04-23 Thread Chuck Aurora
On 2020-04-23 14:16, Sarah Newman wrote: 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. Do you have an example for this?

Question about expected recursive resolver behavior

2020-04-23 Thread Sarah Newman
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-c