SYN FLOOD Control commands

netstat -anutp | grep SYN_RECV | wc -l

vnstat -l -i eth0

htop

tcpdump -i eth0 -nn 'tcp port 80' and 'tcp[13] == 2' -c 100

iptables -A INPUT -p tcp -m state --state NEW -m recent --update --seconds 60 --hitcount 20 -j DROP