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{{Admon/important |firewalld|In this labcourse, we will be using ''iptables'', '''<u>not</u>''' ''firewalld''. Although both firewalld can be used at present information in the same timefamiliar iptables format, that learning both would be too advanced that at this point of learning Linux network administration.<br>In the first labs [http://zenit.senecac.on.ca/wiki/index.php/OPS335_Installation_Lab#Using_iptables Prep for Labs], you should have disabled and stopped the firewalld service: .<br><br>You can also check the status of the firewalld service by issuing the [http://zenit.senecac.on.ca/wiki/index.php/Init_vs_systemd#systemd_Command_Usage systemctl] command. You can also check if the firewalld service is running by issuing '''iptables -L''' and noting a high volume of unexpected output (i.e. "a strange result").