>getaddrinfo() performs an outer loop across all known address families-  in
>this  case IPv6 and IPv4 in that order, passing each request down to the
>resolver library's lower levels

        this is not a protocol issue but purely an implementation issue.
        resolver in *BSD does not do the above.  quick-and-easy implementation
        that calls gethostbyname() from within getaddrinfo() would behave
        like you have described.

itojun
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