--- ntpd/ntp_request.c 2008-08-10 07:02:41.000000000 -0400 +++ ntpd/ntp_request.c.oden 2009-12-08 17:12:02.000000000 -0500 @@ -409,6 +409,7 @@ process_private( int mod_okay ) { + static u_long quiet_until; struct req_pkt *inpkt; struct req_pkt_tail *tailinpkt; struct sockaddr_storage *srcadr; @@ -444,8 +445,14 @@ process_private( || (++ec, INFO_MBZ(inpkt->mbz_itemsize) != 0) || (++ec, rbufp->recv_length < REQ_LEN_HDR) ) { - msyslog(LOG_ERR, "process_private: INFO_ERR_FMT: test %d failed, pkt from %s", ec, stoa(srcadr)); - req_ack(srcadr, inter, inpkt, INFO_ERR_FMT); + NLOG(NLOG_SYSEVENT) + if (current_time >= quiet_until) { + msyslog(LOG_ERR, + "process_private: drop test %d" + " failed, pkt from %s", + ec, stoa(srcadr)); + quiet_until = current_time + 60; + } return; }