How to duplicate traffic with iptables firewall?

Solution Verified - Updated -

Issue

  • How to duplicate traffic with iptables firewall?
  • We are unable to use firewalld to port-forward traffic to multiple destinations
  • Source sends data to System A. System A forwards the received data to System B with NAT. How to also forward the same data to System C?

Environment

  • Red Hat Enterprise Linux 7
  • firewalld or iptables firewall doing port-forward

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