How Do I Block an IP Address on Centos 6 via IPTables

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  1. Open a new Terminal Window
  2. Type the following command replacing IPADDRESSTOBLOCK with the IP Address that you wish to block.
    iptables -A INPUT -s IPADDRESSTOBLOCK -j DROP

    Explanation of above command:

    -A = Append one or more rules to the end of the selected chain
    -s = Source, in this case the IP address to block
    -j = This indicates what to do if the rule matches

  3. Save the Rule to the IPTables
    service iptables save

Image Credits: Photo by Isis França on Unsplash.

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