se_ctrladdr_in6
sep->se_ctrladdr_in6.sin6_family = AF_INET6;
sep->se_ctrladdr_size = sizeof sep->se_ctrladdr_in6;
if (port != sep->se_ctrladdr_in6.sin6_port) {
sep->se_ctrladdr_in6.sin6_port = port;
bcmp(&old->se_ctrladdr_in6.sin6_addr,
&new->se_ctrladdr_in6.sin6_addr,
sizeof(new->se_ctrladdr_in6.sin6_addr)) != 0)
old->se_ctrladdr_in6.sin6_scope_id !=
new->se_ctrladdr_in6.sin6_scope_id)