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===Using iptables===
The most recent variants of Centos and Fedora are using a service called '''firewalld''' that replaces is intended to replace '''iptables''', however the ''iptables'' service is still in relatively common usage. In this course we will keep running ''iptables '' on the host machine, and gain experience with the new service (firewalld) on the virtual machines.
#install and enable iptables
'''yum install iptables-services''' '''systemctl enable iptables'''
<ol><li value="2">disable firewalld by issuing the command:<br></li></ol>
'''systemctl disable firewalld'''
<ol><li value="3">Note that the machine will not switch over to using ''iptables '' until you reboot, but you will be doing that shortly, so there is no need to do so right now.</li></ol>
===Configuring a Linux Gateway===
