Настройка находится в IP->Firewall

/ip firewall filter
add action=drop chain=input comment="Drop - port scanners" src-address-list=\
Port-Scanners
add action=drop chain=forward comment="Drop - port scanners" \
src-address-list=Port-Scanners
add action=add-src-to-address-list address-list=Port-Scanners \
address-list-timeout=2w chain=input comment="Scan - Scan Ports" protocol=\
tcp psd=21,3s,3,1
add action=add-src-to-address-list address-list=Port-Scanners \
address-list-timeout=2w chain=input comment=\
"Scan - NMAP FIN Stealth scan" protocol=tcp tcp-flags=\
fin,!syn,!rst,!psh,!ack,!urg
add action=add-src-to-address-list address-list=Port-Scanners \
address-list-timeout=2w chain=input comment="Scan - SYN/FIN scan" \
protocol=tcp tcp-flags=fin,syn
add action=add-src-to-address-list address-list=Port-Scanners \
address-list-timeout=2w chain=input comment="Scan - SYN/RST scan" \
protocol=tcp tcp-flags=syn,rst
add action=add-src-to-address-list address-list=Port-Scanners \
address-list-timeout=2w chain=input comment="Scan - FIN/PSH/URG scan" \
protocol=tcp tcp-flags=fin,psh,urg,!syn,!rst,!ack
add action=add-src-to-address-list address-list=Port-Scanners \
address-list-timeout=2w chain=input comment="Scan - ALL/ALL scan" \
protocol=tcp tcp-flags=fin,syn,rst,psh,ack,urg
add action=add-src-to-address-list address-list=Port-Scanners \
address-list-timeout=2w chain=input comment="Scan - NMAP NULL scan" \
protocol=tcp tcp-flags=!fin,!syn,!rst,!psh,!ack,!urg

значения Timeout:

• 14d 00:00:00;
• none dynamic – будет находиться в address list до перезагрузки роутера;
• none static – постоянная запись(сохраняется в конфигурации).

По результатам работы сканера создаются записи в Address Lists, которым запрещен доступ в цепочке input на 14 дней.