If your server is currently under DDoS attacks please do the following command:
tcpdump -nn -vvv -c 10000 -w ddos-`date +%F_%T`.pcap
And send us the file ddos.pcap that should be in the root folder, this way it will be faster for us to analyze the attack and block it.
note:
-bash: tcpdump: command not found ?
install tcpdump use yum or ...
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