Protezione Syn-flood:

# iptables -A FORWARD -p tcp --syn -m limit --limit 1/s -j ACCEPT

Protezione port scanning:

# iptables -A FORWARD -p tcp --tcp-flags SYN,ACK,FIN,RST RST -m limit --limit 1/s -j ACCEPT

Protezione ping of death:

# iptables -A FORWARD -p icmp --icmp-type echo-request -m limit --limit 1/s -j ACCEPT