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Looks like only s6_addr is specified in the RFCs (2553 and 3493). Oddly, though, the RFCs give an example implementation using that union with different element names (like _S6_u8), and show the one #define. Similarly, POSIX specifies only s6_addr, but it allows other members of the structure, so I don't see a problem with exposing them all even in a POSIX environment. I would have no objection to exposing all four definitions, especially if Linux apps use them. Mike
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