Mikrotik Cheatsheet [IP firewall filter]
src: http://wiki.mikrotik.com/wiki/Bruteforce_login_prevention To stop SSH/FTP attacks on your router, follow this advice. This configuration allows only 10 FTP login incorrect answers per minute in /ip firewall filter add chain=input protocol=tcp dst-port=21 src-address-list=ftp_blacklist action=drop \ comment="drop ftp brute forcers" 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 This will prevent a SSH brute forcer to be banned for 10 days after repetitive attempts. Change the timeouts as necessary. in /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...