Nginx And HttpRealIpModule

This module is already  enabled by default in cPnginx version 6.0 or  higher . You may simply need to add the   module setting in nginx.conf as follows,

set_real_ip_from   $firewall_ip1;
set_real_ip_from   $firewall_ip2;
real_ip_header     X-Real-IP;

You  may also edit  /usr/local/apache/conf/mod_rpaf.conf with the following

RPAFheader X-Real-IP
RPAFheader X-Forwarded-For

These sttings are required for cloudflare clients.