DNS_MESSAGEFLAG_CD
if ((msg->flags & DNS_MESSAGEFLAG_CD) != 0)
lookup->sendmsg->flags |= DNS_MESSAGEFLAG_CD;
if ((msg->flags & DNS_MESSAGEFLAG_CD) != 0) {
#define DNS_MESSAGE_REPLYPRESERVE (DNS_MESSAGEFLAG_RD|DNS_MESSAGEFLAG_CD)