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 https://matthewsiemens.com/blocking-ssh-brute-force-attacks-in-mikrotik-routeros/

 3    ;;; Drop SSH connection from IP addresses in ssh_blacklist address list
      chain=input action=drop protocol=tcp src-address-list=ssh_blacklist dst-port=10022

 4    ;;; Blocked IP address that attempted multiple SSH connections
      chain=input action=add-src-to-address-list connection-state=new protocol=tcp src-address-list=ssh_attempt_3 address-list=ssh_blacklist address-list-timeout=1d dst-port=10022 log=no

 5    ;;; IP address that attempted to create 3 SSH connections
      chain=input action=add-src-to-address-list connection-state=new protocol=tcp src-address-list=ssh_attempt_2 address-list=ssh_attempt_3 address-list-timeout=30s dst-port=10022 log=no

 6    ;;; IP address that attempted to create 2 SSH connections
      chain=input action=add-src-to-address-list connection-state=new protocol=tcp src-address-list=ssh_attempt_1 address-list=ssh_attempt_2 address-list-timeout=30s dst-port=10022 log=no

 7    ;;; IP address that attempted to create an SSH connections
      chain=input action=add-src-to-address-list connection-state=new protocol=tcp address-list=ssh_attempt_1 address-list-timeout=30s dst-port=10022 log=no

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