>>      - 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.

        we can make it switchable via setsockopt, if the ported application
        requires RFC2553-inbound behavior (i think jim mentioned it in past
        email about netbsd implementation - which is one of the proposals
        from us).

itojun
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