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Drop ip in ddos attack

When you are under DDOS attack, you can run this command to check the number of connections per ips:

netstat -anp |grep ‘tcp|udp’ | awk ‘{print $5}’ | cut -d: -f1 | sort | uniq -c | sort -n

and then drop ip with lets say 300 connection:

iptables -I INPUT -s xxx.xxx.xxx.xxx -j DROP