On Aug 28, 2015, at 5:27 PM, Barry Margolin <bar...@alum.mit.edu> wrote:

> Note that if a server is authoritative-only, caching is mostly 
> irrelevant, so the negative cache TTL doesn't much apply. In this case, 
> the SOA Minimum is just being used as the default TTL.

No, that is not correct. When responding negatively, the authoritative server 
uses the negative caching TTL (the Minimum field) as the TTL of the SOA record 
in the authority section.

Chris
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