How to block a specific IP address?

To block an individual IP address from accessing your Linux server, you can use the following iptables command:


iptables -A INPUT -s IPADDR -j DROP


Simply replace IPADDR with the IP address you are wanting to drop all packets from.


How to block ranges?


Here is an example of a range block:


iptables -A INPUT -s -j DROP


This would block


How to unblock the IP?


Simply change "DROP" in the commands above to "ACCEPT".

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