'''Perform the Following Steps:'''
* :# Start with the default settings. When you install Iptables in CentOS it already has some rules predefined. You will get the default rules if you restart the iptables service.* :# Save your rule in a bash script (.sh file) so you don't lose it and can rerun it easily.
{{Admon/important |Disconnected from VMs|Some of the traffic between your host and VirtManager goes through IPtables. When you mess with IPtables rules on the host - you may end up losing the console connection to the virtual machines. Don't worry, they're still running and you can still use them.}}
* <ol><li value="3">If your command didn't work - the easiest thing to do is:** <ul><li>Reload the default rules. You can do that by restarting the iptables service (you can also do that at the beginning of your shell script).** Then </li><liThen run your script with all the working iptables commands that you already finished.** </li><li>Go back to writing the rule that didn't work.</li></ul></li></ol>
===Creating Customized Chains===