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In order to block a specific IP address, you need to add a Firew= all filter rule.
Follow these steps to add filter rule using Winbox:
code
/ip firewall filter add chain=3Dinput src-address=3D1.1.1.1 action=3Ddro= p
Chain "input" limit the connection to the device itself. To limit traffi= c going through the device use chain "forward". Please refer to the Building Your First Fir= ewall