Where does firewalld map it's ICMP types located in /usr/lib/firewalld/icmptypes to
actual ICMP types like these:
https://www.iana.org/assignments/icmp-parameters/icmp-parameters.xhtml.
For example, I don't see anything in echo-request.xml indicating it's ICMP type 8,
so how does the firewall know when filtering ICMP packets?
Thanks,
Scott