How to define a conntrack helper when writing a new firewalld service

Solution Verified - Updated -

Issue

  • How to define a conntrack helper when writing a new firewalld service?
  • What are firewalld helpers?
  • What firewalld helpers are available and how to use them?

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

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