Block an IP iptables -I INPUT -s 43.229.53.37 -j DROP After rebooting the server we notice the rules are removed. It’s best to save your configs and restore them after a reboot. iptables-save > /etc/iptables/rules iptables-restore < /etc/iptables/rules flush all rules iptables -F flush rules in the input chain iptables -F INPUT iptables -L –line-numbers
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