RESTRICTING NETWORK ACCESS WITH IPTABLES

The first thing is to install the iptables-services.x86_64 package.

[root@slave ~]# yum -y install iptables-services.x86_64
In this example, we will be blocking traffic from the 10.10.0.0/8 network.

[root@slave ~]# iptables -A INPUT -s 10.10.0.0/8 -j REJECT
[root@slave ~]# service iptables restart
Redirecting to /bin/systemctl restart iptables.service
Verify that the network is being blocked by issuing the following command:

[root@slave ~]# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
REJECT all — 10.0.0.0/8 anywhere reject-with icmp-port-unreachable