Replacing the user's ip address with the cloudflare subnet ip

I’m having a ddos attack right now… Which went past the CF.

My tech support configured the server to accept users only from CF. For that their incoming ip must be from the cloudflare subnet.

Please help me set up CF to replace ip

Any requests proxied through Cloudflare will have an IP address from the list at cloudflare.com/ips, but will have a header with the user’s actual IP address:

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