iptables -A SCAN -p tcp --dport 25 -m recent --set --name SMTP
iptables -A SCAN -p tcp --dport 22 -m recent --set --name SSH
iptables -A SCAN -p tcp --dport 21 -m recent --set --name FTP
iptables -A SCAN -m recent --update --seconds 300 --hitcount 5 --name SMTP -j DROP
iptables -A SCAN -m recent --update --seconds 300 --hitcount 5 --name SSH -j DROP
iptables -A SCAN -m recent --update --seconds 300 --hitcount 5 --name FTP -j DROP
another way
#Anti-Bruteforce for SSH
iptables -N SSHSCAN
iptables -A INPUT -p tcp --dport 22 -m state --state NEW -j SSHSCAN
iptables -A SSHSCAN -m recent --set --name SSH
iptables -A SSHSCAN -m recent --update --seconds 3600 --hitcount 5 --name SSH -j DROP
iptables -A SSHSCAN -m recent --update --seconds 3600 --hitcount 5 --name SSH -j LOG --log-level info --log-prefix "Anti SSH-Bruteforce: "
iptables -N SSHSCAN
iptables -A INPUT -p tcp --dport 22 -m state --state NEW -j SSHSCAN
iptables -A SSHSCAN -m recent --set --name SSH
iptables -A SSHSCAN -m recent --update --seconds 3600 --hitcount 5 --name SSH -j DROP
iptables -A SSHSCAN -m recent --update --seconds 3600 --hitcount 5 --name SSH -j LOG --log-level info --log-prefix "Anti SSH-Bruteforce: "
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>> PORTSCAN DETECTOR <<
# Anti nmap :)
iptables -N PORTSCAN
iptables -A INPUT -i all -p tcp --tcp-flags ALL FIN,URG,PSH -m recent --set -j PORTSCAN
iptables -A FORWARD -i all -p tcp --tcp-flags ALL FIN,URG,PSH -m recent --set -j PORTSCAN
# SYN/RST
iptables -A INPUT -i all -p tcp --tcp-flags SYN,RST SYN,RST -m recent --set -j PORTSCAN
iptables -A FORWARD -i all -p tcp --tcp-flags SYN,RST SYN,RST -m recent --set -j PORTSCAN
# SYN/FIN -- Scan(probably)
iptables -A INPUT -i all -p tcp --tcp-flags SYN,FIN SYN,FIN -m recent --set -j PORTSCAN
iptables -A FORWARD -i all -p tcp --tcp-flags SYN,FIN SYN,FIN -m recent --set -j PORTSCAN
# NMAP FIN Stealth
iptables -A INPUT -i all -p tcp --tcp-flags ALL FIN -m recent --set -j PORTSCAN
iptables -A FORWARD -i all -p tcp --tcp-flags ALL FIN -m recent --set -j PORTSCAN
# ALL/ALL Scan
iptables -A INPUT -i all -p tcp --tcp-flags ALL ALL -m recent --set -j PORTSCAN
iptables -A FORWARD -i all -p tcp --tcp-flags ALL ALL -m recent --set -j PORTSCAN
# NMAP Null Scan
iptables -A INPUT -i all -p tcp --tcp-flags ALL NONE -m recent --set -j PORTSCAN
iptables -A FORWARD -i all -p tcp --tcp-flags ALL NONE -m recent --set -j PORTSCAN
#XMAS
iptables -A INPUT -i all -p tcp --tcp-flags ALL URG,ACK,PSH,RST,SYN,FIN -m recent --set -j PORTSCAN
iptables -A FORWARD -i all -p tcp --tcp-flags ALL URG,ACK,PSH,RST,SYN,FIN -m recent --set -j PORTSCAN
iptables -A PORTSCAN -m limit --limit 1/second -j LOG --log-level info --log-prefix "PORTSCAN -- SHUN " --log-tcp-sequence --log-tcp-options --log-ip-options
# Drop this packet !!
iptables -A PORTSCAN -j DROP
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