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#Run '''diff -u before.txt after.txt''' and figure out how to read the output.
{{Admon/tip|Graphically Compare File Differences|You can also install a graphical tool that makes it much easier to see differences: '''kompare before.txt after.txt}}
<ol><li value="8">You can use these tools to compare any two text files, they often come in handy. Note in your lab logbook the iptables rules that were added automatically by the '''libvirtd''' service.</li><li>Are there any differences between those 2 files? What does this mean if your VMs get disconnected in terms of the firewall rules?</li><li>You should notice the virtual machine manager no longer contains the vms. Close and then restart the virtual machine manager. What Happens? <br> What are the states of your VMs?<br><br>Record your observations in your lab logbook.</li></ol>
=== Practice Setting Firewall Rules ===