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Retrieving real client IP when proxy through Cloudflare

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Restore real client IP

Note: if using IP table and allowing only CDN’s IP ranges, would caused blockage when enabling true client IP as the server only recognise inbound request client IP.

vim /etc/nginx/nginx.conf
    # add below to the bottom of the http { ... } block

Set_real_ip_from CND IPs

http {
    set_real_ip_from 204.93.240.0/24;
    set_real_ip_from 204.93.177.0/24;
    set_real_ip_from 199.27.128.0/21;
    set_real_ip_from 173.245.48.0/20;
    set_real_ip_from 103.21.244.0/22;
    set_real_ip_from 103.22.200.0/22;
    set_real_ip_from 103.31.4.0/22;
    set_real_ip_from 141.101.64.0/18;
    set_real_ip_from 108.162.192.0/18;
    set_real_ip_from 190.93.240.0/20;
    set_real_ip_from 188.114.96.0/20;
    set_real_ip_from 197.234.240.0/22;
    set_real_ip_from 198.41.128.0/17;
    set_real_ip_from 162.158.0.0/15;
    real_ip_header     CF-Connecting-IP;
}