How can cloudflare protect against DDOS on IP address?

My dedicated server is being attacked every day and looks my actual hoster ( is unable to solve the issue : they ask me to send me list of IPs that do attack me so they can blacklist them.

Each attack makes my server unusable and arbor mitigation does not help me at all.

I just wonder : can Cloudflare is really useful and effective for that ?

Since attack is done directly on server IP, this by pass totally Cloudflare structures: am I right or do I miss something ?

It’s better to block all, then whitelist Cloudflare’s IP address. This is how I block attacks against my server’s IP address.

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