How you can block an IP address in your Linux Server Print

  • ip filter, ip block, security, dedicated server
  • 13

If you want to block an IP to access your linux server, you will need to login to the shell as root. Your server will either have the ipchains or iptables firewall to help accomplish this.


In this example, the attacking IP is


If you are using ipchains type: ipchains -A input -j DENY -p all -l -s

If you are using iptables type: iptables -A INPUT -s -j DROP


If you just want to block access to one port from an IP:


iptables -A INPUT -s -p tcp -destination-port 80 -j DROP


The above would drop all packets from to port 80 (HTTP) on your server.

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