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: /lib/firewalld/icmptypes/

files >> //lib/firewalld/icmptypes/unknown-option.xml

 <?xml version="1.0" encoding="utf-8"?>
<icmptype>
  <short>Unknown Option</short>
  <description>This error message is sent if an unrecognized IPv6 option encountered.</description>
  <destination ipv4="no"/>
  <destination ipv6="yes"/>
</icmptype>