What's this? CloudFlare Network is doing a SYN flood on my server!

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This sounds incredible, but it actually happened on my server.

This sounds incredible, but it actually happened on my server.
I did a tcpdump from my server, but I can’t upload the pcap file.
I can’t understand how he used the Cloudflare network to do the SYN flood attack.
I need help from Cloudflare.

SYN flood DDoS attack | Cloudflare
I am so sorry, it appears this attack has nothing to do with Cloudflare.
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