Here is an example of how to defend against bruteforce attacks on an ssh port. Please note, that ssh allows 3 login attempts per connection and the address lists are not cleared upon a successful login, so it is possible to blacklist yourself accidentally.
https://help.mikrotik.com/docs/display/ROS/Bruteforce+prevention
https://help.mikrotik.com/docs/display/ROS/Bruteforce+prevention
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- mikrotik, routerboard, routeros
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