Retrieving real client IP when proxy through Cloudflare
Table of contents
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;
}