封超过100个连接的IP防DDOS

Standard
#!/bin/sh
/bin/netstat -an|grep ESTABLISHED|awk{print $5}|awk -F: ‘{print $1}|sort|uniq -c|sort -rn|grep -v -E172.10|127.0|awk{if ($2!=null && $1>100) {print $2}}>/tmp/ddosip
for i in $(cat /tmp/ddosip)
do
/sbin/iptables -I INPUT  -p tcp -m tcp -s $i –dport 80 –syn -j REJECT
done

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