[Bug 248102] [local_unbound] default config file violates RFC

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248102

--- Comment #5 from Walter von Entferndt <walter.von.entferndt at posteo.net> ---
(In reply to Rodney W. Grimes from comment #4)
Thank you for supporting my suggestion, and referencing the much more
appropriate RFC 6761 Section 6.1.4: "[...] Instead, caching DNS servers SHOULD,
_by_
       _default_, generate immediate (positive or negative) responses for
       all such queries.  [...]  Caching DNS servers SHOULD
       offer a configuration option (_disabled_ _by_ _default_) to enable
       upstream resolution of such names, [...]"
(add. underlining to make clear to point of interest)

Now again, since SHOULD/SHOULD NOT reads (RFC 1918): "[...] the case carefully
weighed before implementing any behavior described with this label."
I want to repeat that a SHOULD/SHOULD NOT _must_ _not_ be overridden
_arbitrarily_ just because it's not a MUST/MUST NOT.  This is clearly /not/ the
case: there can no weighting w/o knowing the special circumstances of the
deploying network.  Thus, a SHOULD/SHOULD NOT has _regularly_ to be taken like
MUST/MUST NOT for the domain of shipping default configurations.  Very few
exceptions may exist to this rule.  In this case, I can not see any valid
reason, no matter how hard I try.

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