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How to identify DDoS attack?

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  1. #1
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    How to identify DDoS attack?

    Hello all,

    I'm new to this. How do you know or identify if my VPS is under a DDoS attack?

    Thanks in advance.
    Harry G.

  2. #2
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    This is not simple question to awnser. Servers can be attacked via DDOS in many different ways from packet attacks to a particular service being targeted such as Apache.

    This command will show the ips are connecting to server and how many connections exist from each IP:
    Code:
     netstat -anp |grep 'tcp\|udp' | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n
    If it's zombie bot attack you will see many thousands of connections.

    Show the active connections to Apache

    Code:
     netstat -apn | grep :80 | wc -l

    DDOS is not really something dealt with on the server level but rather the network level. I recommend CSF firewall and it's included DDOS protection, it will start blocking IP when it detects huge amounts of connections or raw traffic.

    Hope this helps
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  3. #3
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    I will recommend to install mod_security, I know that he can handle some DDos attaks.
    Maybe its better to contaminate with CSF firewall

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