{{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 you'll have iptables services on your host and firewalld on your VMs - look at the state of iptables on both to learn how to see the difference.After you've figured that out - replace firewalld with iptables services (the steps are in the [http://zenit.senecac.on.ca/wiki/index.php/OPS335_Installation_Lab#Using_iptables_Prep for Labs]).}}