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[ipv4] Allow IPv4 socket addresses to include a scope ID
Extend the IPv6 concept of "scope ID" (indicating the network device index) to IPv4 socket addresses, so that IPv4 multicast transmissions may specify the transmitting network device. The scope ID is not (currently) exposed via the string representation of the socket address, since IPv4 does not use the IPv6 concept of link-local addresses (which could legitimately be specified in a URI). Signed-off-by: Michael Brown <mcb30@ipxe.org>
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