IPV6_RECVPKTINFO
case IPV6_RECVPKTINFO:
case IPV6_RECVPKTINFO:
case IPV6_RECVPKTINFO:
rc = setsockopt(sd, SOL_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one));
if (setsockopt(fd, SOL_IPV6, IPV6_RECVPKTINFO,