Configure the loopback interface to accept traffic. Configure all other interfaces to deny traffic to the loopback network (127.0.0.0/8).Loopback traffic is generated between processes on machine and is typically critical to operation of the system. The loopback interface is the only place that loopback network (127.0.0.0/8) traffic should be seen, all other interfaces should ignore traffic on this network as an anti-spoofing measure. FIX: While using iptables, #yum remove -y firewalld #yum install -y iptables iptables-services #systemctl enable iptables # iptables -A INPUT -i lo -j ACCEPT # iptables -A OUTPUT -o lo -j ACCEPT # iptables -A INPUT -s 127.0.0.0/8 -j DROP #service iptables save Note: In the presence of firewalld package, iptables rules cannot be set as permanent. But removing firewalld package will lead to the removal of all rules currently configured in the machine. So patch is not provided for the rule.

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Run the following command: # iptables -A INPUT -i lo -j ACCEPT # iptables -A OUTPUT -o lo -j ACCEPT # iptables -A INPUT -s 127.0.0.0/8 -j DROP