Drop port scanners
------------------

# To protect the Router from port scanners, we can record the IPs of hackers 
# who try to scan your box. Using this address list we can drop connection from those IP

# in 

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/ip firewall filter
add chain=input protocol=tcp psd=21,3s,3,1 action=add-src-to-address-list address-list="port scanners" 
address-list-timeout=2w comment="Port scanners to list " disabled=no
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# Chain ini dipakai untuk mendaftar ip ke black-list address list
# Chain selanjutnya untuk mendeteksi apakah ada indikasi aktifitas port scanner:

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add chain=input protocol=tcp tcp-flags=fin,!syn,!rst,!psh,!ack,!urg 
action=add-src-to-address-list address-list="port scanners" 
address-list-timeout=2w comment="NMAP FIN Stealth scan"

add chain=input protocol=tcp tcp-flags=fin,syn 
action=add-src-to-address-list address-list="port scanners"
address-list-timeout=2w comment="SYN/FIN scan"

add chain=input protocol=tcp tcp-flags=syn,rst 
action=add-src-to-address-list address-list="port scanners"
address-list-timeout=2w comment="SYN/RST scan"

add chain=input protocol=tcp tcp-flags=fin,psh,urg,!syn,!rst,!ack 
action=add-src-to-address-list address-list="port scanners" 
address-list-timeout=2w comment="FIN/PSH/URG scan"

add chain=input protocol=tcp tcp-flags=fin,syn,rst,psh,ack,urg
action=add-src-to-address-list address-list="port scanners" 
address-list-timeout=2w comment="ALL/ALL scan"

add chain=input protocol=tcp tcp-flags=!fin,!syn,!rst,!psh,!ack,!urg 
action=add-src-to-address-list address-list="port scanners" 
address-list-timeout=2w comment="NMAP NULL scan"

# jika ada tanda tanda dari kejadian di atas, maka harus didrop scanning IPnya pakai perintah ini:

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add chain=input src-address-list="port scanners" action=drop comment="dropping port scanners" disabled=no
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