
IPv6 interface address (e.g., sin6_addr fe80::200:24ff:fec3:4bac sin6_scope_id 1), set a multicast interface with setsockopt(,IPPROTO_IPV6,IPV6_MULTICAST_IF,), and sendto(2) multicast destinations with "wildcard" scope ID, 0, without error EHOSTUNREACH. Prior to this patch, sendto(2) would exit with EHOSTUNREACH, even though the scope ID was unambiguously specified both by bind(2) and setsockopt(2). This was a bug because it broke old applications. Thanks JINMEI Tatuya for the patch!
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