title: how to block all incoming trafic for all ports from all except subnet ips
body: <p>how to block all incoming traffic for all ports from all except subnet ips</p>
  <p>i try block all incoming connections from all except</p>
  <p>these ips</p>
  <blockquote>
  <p>199.27.128.0/21
  173.245.48.0/20
  103.21.244.0/22
  103.22.200.0/22
  103.31.4.0/22</p>
  <p>141.101.64.0/18</p>
  <p>108.162.192.0/18
  190.93.240.0/20
  188.114.96.0/20
  197.234.240.0/22
  198.41.128.0/17
  162.158.0.0/15</p>
  </blockquote>
  <p>by using linux  centos 6 iptables
  that's will help to control all incoming traffic
  i try many command but it's not help me</p>