iptables -N SCANS
iptables -A SCANS -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
iptables -A SCANS -p tcp --tcp-flags ALL ALL -j DROP
iptables -A SCANS -p tcp --tcp-flags ALL NONE -j DROP
iptables -A SCANS -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
iptables -A INPUT -f -j DROP
iptables -A INPUT -p tcp ! --syn -m state --state NEW -j DROP
iptables -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
iptables -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
iptables -A INPUT -p icmp -j DROP
iptables -t mangle -A PREROUTING -p tcp --tcp-flags ALL ALL -j DROP
iptables -t mangle -A PREROUTING -m conntrack --ctstate INVALID -j DROP
iptables -t mangle -A PREROUTING -p tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -j DROP
iptables -t mangle -A PREROUTING -p tcp --tcp-flags FIN,SYN FIN,SYN -j DROP
iptables -t mangle -A PREROUTING -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
iptables -t mangle -A PREROUTING -p tcp --tcp-flags FIN,RST FIN,RST -j DROP
iptables -t mangle -A PREROUTING -p tcp --tcp-flags FIN,ACK FIN -j DROP
iptables -t mangle -A PREROUTING -p tcp --tcp-flags ACK,URG URG -j DROP
iptables -t mangle -A PREROUTING -p tcp --tcp-flags ACK,FIN FIN -j DROP
iptables -t mangle -A PREROUTING -p tcp --tcp-flags ACK,PSH PSH -j DROP
iptables -t mangle -A PREROUTING -p tcp --tcp-flags ALL ALL -j DROP
iptables -t mangle -A PREROUTING -p tcp --tcp-flags ALL NONE -j DROP
iptables -t mangle -A PREROUTING -p tcp --tcp-flags ALL FIN,PSH,URG -j DROP
iptables -t mangle -A PREROUTING -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j DROP
iptables -A INPUT -m state --state INVALID -j DROP
iptables -A FORWARD -m state --state INVALID -j DROP
iptables -A OUTPUT -m state --state INVALID -j DROP
iptables -A INPUT -p tcp -m tcp --tcp-flags RST RST -m limit --limit 2/second --limit-burst 2 -j ACCEPT
iptables -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
iptables -A INPUT -p icmp --icmp-type address-mask-request -j DROP
iptables -A INPUT -p icmp --icmp-type timestamp-request -j DROP
iptables -A INPUT -p icmp --icmp-type router-solicitation -j DROP
iptables -A INPUT -p icmp -m limit --limit 2/second -j ACCEPT
iptables -A INPUT -p tcp -m state --state NEW -m limit --limit 50/second --limit-burst 50 -j ACCEPT
iptables -A INPUT -p tcp -m state --state NEW -j DROP
iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A INPUT -m recent --name portscan --rcheck --seconds 86400 -j DROP
iptables -A FORWARD -m recent --name portscan --rcheck --seconds 86400 -j DROP
iptables -A INPUT -p tcp -m conntrack --ctstate NEW -j DROP
iptables -A INPUT -p tcp --tcp-flags RST RST -j DROP
iptables -A INPUT -p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -m state --state NEW -j DROP
iptables -A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,SYN,RST,PSH,ACK,URG -j DROP
iptables -A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -j DROP
iptables -A INPUT -p tcp -m tcp --tcp-flags FIN,ACK FIN -j DROP
iptables -A INPUT -p tcp -m tcp --tcp-flags PSH,ACK PSH -j DROP
iptables -A INPUT -p tcp -m tcp --tcp-flags ACK,URG URG -j DROP
iptables -A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN -j DROP
iptables -A INPUT -p tcp -m tcp --tcp-flags FIN,RST FIN,RST -j DROP
iptables -A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK RST -m limit --limit 1/sec -j ACCEPT
iptables -A INPUT -p tcp -m tcp --tcp-flags SYN,ACK SYN,ACK -m state --state NEW -j DROP
iptables -A INPUT -p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -j DROP
iptables -I INPUT -p tcp --dport 80 -m state --state NEW -m recent --set
iptables -I INPUT -p tcp --dport 80 -m state --state NEW -m recent --update --seconds 20 --hitcount 10 -j DROP
iptables -A INPUT -p tcp -m conntrack --ctstate NEW -m limit --limit 60/s --limit-burst 20 -j ACCEPT
iptables -A INPUT -p tcp --tcp-flags RST RST -m limit --limit 2/s --limit-burst 2 -j ACCEPT
