MikroTik Firewall Filter Rules for Better Security

/ip firewall filter add chain=forward dst-port=11211 protocol=udp action=drop comment="Memcrashed - Amplification Attacks UDP 11211"

/ip firewall filter add chain=forward connection-state=new action=jump jump-target=block-ddos comment="Anti DDoS Attacks" add chain=forward connection-state=new src-address-list=ddoser dst-address-list=ddosed action=drop add chain=block-ddos dst-limit=50,50,src-and-dst-addresses/10s action=return add chain=block-ddos action=add-dst-to-address-list address-list=ddosed address-list-timeout=10m add chain=block-ddos action=add-src-to-address-list address-list=ddoser address-list-timeout=10m

/ip firewall filter # Add port scanners to an address list. 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="Mark Source ip port scanner to Address list " disabled=no # NMAP FIN stealth 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 FIN Stealth scan" # SYN/FIN 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" # SYN/RST 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" # FIN/PSH/URG 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" # 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="ALL/ALL scan" # NMAP NULL 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" # Drop port scanners. add chain=input src-address-list="port scanners" action=drop comment="Drop port scanners" disabled=no

/ip firewall filter # Drop FTP brute-force sources. add action=drop chain=input comment="drop ftp BRUTE FORCErs" dst-port=21 protocol=tcp src-address-list=ftp_blacklist add action=accept chain=output content="530 Login incorrect" dst-limit=1/1m,9,dst-address/1m protocol=tcp add action=add-dst-to-address-list address-list=ftp_blacklist address-list-timeout=3h chain=output content="530 Login incorrect" protocol=tcp # Drop SSH/Telnet brute-force sources. add action=drop chain=input comment="drop ssh BRUTE FORCErs" dst-port=22-23 protocol=tcp src-address-list=ssh_blacklist add action=add-src-to-address-list address-list=ssh_blacklist address-list-timeout=1w3d chain=input connection-state=new dst-port=22-23 protocol=tcp src-address-list=ssh_stage3 add action=add-src-to-address-list address-list=ssh_stage3 address-list-timeout=1m chain=input connection-state=new dst-port=22-23 protocol=tcp src-address-list=ssh_stage2 add action=add-src-to-address-list address-list=ssh_stage2 address-list-timeout=1m chain=input connection-state=new dst-port=22-23 protocol=tcp src-address-list=ssh_stage1 add action=add-src-to-address-list address-list=ssh_stage1 address-list-timeout=1m chain=input connection-state=new dst-port=22-23 protocol=tcp add action=drop chain=forward comment="drop ssh brute downstream" dst-port=22-23 protocol=tcp src-address-list=ssh_blacklist