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BSD PF Firewall Block All IPs Except A few IPS to MySQL Port

Fig.02: BSD PF Firewall Block All IPs Except A few IPS to MySQL Port

The syntax is:

block in on vr1 proto tcp from any to  ! 1.2.3.4 port 3306

In the above example, block access for tcp port number 3306 for all except an IP address called 1.2.3.4

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Examples and usage: MySQL/MariaDB Server: Bind To Multiple IP Address

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