{{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 that this point of learning Linux network administration. Before you start doing work on these labs you need to make sure you're using iptables and not firewalld. To determine what you're currently using you can run a '''systemctl''' command or two. Also you can see that you're using firewalld if you run '''iptables -L''' and see lots and lots of unexpected output.<br><br>At this point In the first labs, Prep for labs, you'll should have iptables services on your host disabled and firewalld on your VMs - look at the state of iptables on both to learn how to see stopped the difference. After you've figured that out - replace firewalld with iptables services (the steps are in the service: [http://zenit.senecac.on.ca/wiki/index.php/OPS335_Installation_Lab#Using_iptables_Prep Using_iptables Prep for Labs]).<br><br>You can confirm that the firewalld service is disabled by using the '''systemctl''' command to check the status. You can also check if the firewalld service is running by issuing '''iptables -L''' a high volume of unexpected output.