RHEL: How does iptables work with ip_conntrack for UDP connections?

Solution In Progress - Updated -

Issue

  • UDP connections are stateless. How can I track UDP packets in the kernel and use the state information for matching on ip_tables rules?
  • Why is my UDP application output datagrams is occasionally missing an iptables rule with -m state --state ESTABLISHED?

Environment

  • Red Hat Enterprise Linux
  • iptables
  • ip_conntrack

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