how to prevent denial of service attack ubuntu

How to check for and stop DDoS attacks on Linux

netstat -ntu|awk '{print $5}'|cut -d: -f1 -s |cut -f1,2 -d'.'|sed 's/$/.0.0/'|sort|uniq -c|sort -nk1 -r
sudo apt-get install net-tools -y
netstat -ntu|awk '{print $5}'|cut -d: -f1 -s |cut -f1,2,3 -d'.'|sed 's/$/.0/'|sort|uniq -c|sort -nk1 -r
netstat -anp |grep 'tcp\|udp' | awk '{print $5}' | cut -d: -f1 | sort | uniq -c
sudo netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n
sudo route add ADDRESS reject
sudo iptables -A INPUT -s ADDRESS/SUBNET -j DROP

Leave a Reply