Changes

<li>The firewall configuration is altered by the addition of the virtualization software. Restart Centos7 uses firewalld for firewall, but we will be switching back to using iptables. Issue the following series of command to install iptables and restart the firewall so that these changes become active: <br><br> <b><code><span style="color:#3366CC;font-size:1.2em;">systemctl stop firewalld</span></code></b><br><code><span style="color:#3366CC;font-size:1.2em;">systemctl mask firewalld</span></code></b><br><code><span style="color:#3366CC;font-size:1.2em;">service iptables restart</span></code></b><br><code><span style="color:#3366CC;font-size:1.2em;">yum install iptables-services</span></code></b><br><code><span style="color:#3366CC;font-size:1.2em;">systemctl enable iptables</span></code></b><br><code><span style="color:#3366CC;font-size:1.2em;">systemctl start iptables</span></code><br><code><span style="color:#3366CC;font-size:1.2em;">service iptables save</span></code> iptables</li>