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You were exposed to iptables in your OPS235 course. You should refer to those notes or find and use documentation to learn how to complete these tasks. You can also ask your professor or lab assistant during the lab for help when using iptables. Some basic iptables commands are provided in this lab for reference, but it is also essential that you know how to obtain help (man pages and online) in order to become self-reliant.
{{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..}}
== Firewalld ==
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 [[OPS335_Installation_Lab]]).