>       - change RFC2553 API to disable RFC2553-inbound
>               PROS: applications gets simplified very well, AF_INET6 is
>                       always IPv6, AF_INET is always IPv4 (good for security)
>               PROS: RFC2553-inbound case is gone, application writers do not
>                       need to care about RFC2553-inbound cases
>               CONS: SIIT itself is okay, but now unnatural

This also has the CONS that it makes it harder to port current AF_INET
server applications to support both IPv4 and IPv6 - you can no longer have
a single in6addr_any AF_INET6 listening/receiving socket.

  Erik

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