Ip tables rules that don't block mysql code example

Example 1: close external port 3306 with iptables

iptables -A INPUT -p tcp --dport 3306 -s 127.0.0.1 -d 127.0.0.1 -j ACCEPT
iptables -A INPUT -p tcp --dport 3306 -j DROP

Example 2: close external port 3306 with iptables

iptables -D INPUT -p tcp --dport 3306 -s 127.0.0.1 -d 127.0.0.1 -j ACCEPT
iptables -D INPUT -p tcp --dport 3306 -j DROP

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