{{Admon/important |firewalld|In this lab we will be using ''iptables'', '''<u>not</u>''' ''firewalld''. Although both can be used at the same time, that would be too advantaged advanced that this point of learning Linux network administration.<br>In the first labs, '''Prep for labs''', you should have disabled and stopped the firewalld service: [http://zenit.senecac.on.ca/wiki/index.php/OPS335_Installation_Lab#Using_iptables Prep for Labs].<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").