Untuk ngedrop/deny/blocking yang coba login ke FTP Service mikrotik Kita (Jika 10 kali gagal login dalam 1 menit, maka IP-nya akan masuk ke blocking address-list) :

/ip firewall filter

add chain=input protocol=tcp dst-port=21 src-address-list=ftp_blacklist action=drop

add chain=output action=accept protocol=tcp content="530 Login incorrect" dst-limit=1/1m,9,dst-address/1m

add chain=output action=add-dst-to-address-list protocol=tcp content="530 Login incorrect" \ address-list=ftp_blacklist address-list-timeout=3h

Yang ini untuk memblock yang coba2 login ke SSH mikrotik kita, IP-nya akan nongkrong 10 hari di address-list

/ip firewall filter

add chain=input protocol=tcp dst-port=22 src-address-list=ssh_blacklist action=drop \ comment="drop ssh brute forcers" disabled=no

add chain=input protocol=tcp dst-port=22 connection-state=new \ src-address-list=ssh_stage3 action=add-src-to-address-list address-list=ssh_blacklist \ address-list-timeout=10d comment="" disabled=no

add chain=input protocol=tcp dst-port=22 connection-state=new \ src-address-list=ssh_stage2 action=add-src-to-address-list address-list=ssh_stage3 \ address-list-timeout=1m comment="" disabled=no

add chain=input protocol=tcp dst-port=22 connection-state=new src-address-list=ssh_stage1 \ action=add-src-to-address-list address-list=ssh_stage2 address-list-timeout=1m comment="" disabled=no

add chain=input protocol=tcp dst-port=22 connection-state=new action=add-src-to-address-list \ address-list=ssh_stage1 address-list-timeout=1m comment="" disabled=no


Sumber : http://wiki.mikrotik.com