How to make Iptables persistent across reboots ?

Solution Verified - Updated -

Issue

  • It appears that after a reboot, iptables begins wide open, and not with the firewall state as it was before reboot.
  • What is the trick to make iptables services persistent across reboots?

Environment

  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6

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