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Linux server under a DDoS attack from an IP address? | Easy Instructions Edit
Last Update:2024-10-17 09:37:34
The Change:2024-10-16 10:33:26
Find out what IP addresses are connected to your server. 
sudo apt-get install net-tools -y

Check Server Load

Be sure to check when everything is running normally, so you have a base number to compare it to. 
grep processor /proc/cpuinfo | wc -l

Checking Your Network Load

We need to install nload for this operation. There are other tools but this is the one we use. 
sudo apt-get install nload -y

Cent OS Command

sudo dnf install nload -y

Running The Tool

In order to run the tool use this command. 
nload

Find Out What IP addresses Are Connected To Your Server

netstat -ntu|awk '{print $5}'|cut -d: -f1 -s|sort|uniq -c|sort -nk1 -r
If you see an ip address that has numerous connections they are the ones responsible for the attack. Block them by entering this command. 
sudo route add IP-ADDRESS reject
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