IP_HDRINCL
if (setsockopt(sock, IPPROTO_IP, IP_HDRINCL, &on,
setsockopt(s, IPPROTO_IP, IP_HDRINCL, &hold, sizeof(hold));
case IP_HDRINCL:
case IP_HDRINCL:
if (setsockopt(s, IPPROTO_IP, IP_HDRINCL, &rd, sizeof(rd)) == -1) {
#ifdef IP_HDRINCL
if (setsockopt(sndsock, IPPROTO_IP, IP_HDRINCL, (char *)&on,