Why crond is generating huge amount of dns queries on system?

Solution Verified - Updated -

Issue

  • Crond is generating huge amount of dns queries, generating heavy traffic on DNS server.
# tcpdump port 53
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
14:39:01.520668 IP 192.168.1.1.37153 > 192.168.1.2.domain:57474+ A? cron.example.com. (36)
14:39:01.521114 IP 192.168.1.1.37153 > 192.168.1.2.domain:4358+ AAAA? cron.example.com. (36)

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Crond

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