/usr/lib/firewalld/icmptypes/ Current File: //usr/lib/firewalld/icmptypes/host-unknown.xml

<?xml version="1.0" encoding="utf-8"?>
<icmptype>
  <short>Host Unknown</short>
  <description>This error message is sent if the destination host is unknown.</description>
  <destination ipv4="yes"/>
  <destination ipv6="no"/>
</icmptype>