I'm talking about 1 name with multiple addresses being
        returned in multiple scopes.  I'm taking about having
        getaddrinfo() then filter out the inappropriate addresses
        using local knowledge and setting sin6_scope_id.
        This deals with 99.9% of address lookup.

No, Mark, it doesn't, because the party that calls getaddrinfo
isn't necessarily the same as the party (and doesn't share the same
scopes as the party) that uses the addressees.

there are numerous good reasons that many apps do NOT do a DNS lookup 
each time they want to contact another host.

Keith
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