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POSIX implementation of local network interface enumeration.
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On FreeBSD, kill the embedded interface indices in link-local scoped
addresses.
@param family: The address family of the packed address - one of the
I{socket.AF_*} constants.
@param packed: The packed representation of the address (ie, the bytes of a
I{in_addr} field).
@type packed: L{bytes}
@return: The packed address with any FreeBSD-specific extra bits cleared.
@rtype: L{bytes}
@see: U{https://twistedmatrix.com/trac/ticket/6843}
@see: U{http://www.freebsd.org/doc/en/books/developers-handbook/ipv6.html#ipv6-scope-index}
@note: Indications are that the need for this will be gone in FreeBSD >=10.
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Call C{getifaddrs(3)} and return a list of tuples of interface name, address
family, and human-readable address representing its results.
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Return a list of strings in colon-hex format representing all the link local
IPv6 addresses available on the system, as reported by I{getifaddrs(3)}.
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