How do I restore original visitor IP with Nginx? CloudFlare

Since CloudFlare acts as a reverse proxy, all connections now come from one of CloudFlare’s IP addresses. CloudFlare follows industry standards and includes the originating IP address in the X-Forwarded-For header. The CF-Connecting-IP header may also be used. To preserve the originating IP of your visitor, use the following Nginx module and parameters:

http://nginx.org/en/docs/http/ngx_http_realip_module.html

#CloudFlare
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;
set_real_ip_from 104.16.0.0/12;
set_real_ip_from 172.64.0.0/13;
set_real_ip_from 2400:cb00::/32;
set_real_ip_from 2606:4700::/32;
set_real_ip_from 2803:f800::/32;
set_real_ip_from 2405:b500::/32;
set_real_ip_from 2405:8100::/32;
real_ip_header CF-Connecting-IP;

You can either use X-Forwarded-For (if you run other proxies) or you can use CF-Connecting-IP. The full list of CloudFlare IP addresses.

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