Reverse proxy

A reverse proxy is usually used as a front-end to control and protect access to a server . A reverse proxy commonly also performs tasks such as load-balancing, authentication, decryption or caching . Cloudflare ,Incapsula and Cloudlayar this three sites provide Content Delivery Network (CDN) and also secure the websites andoptimize.


 

1) Cloudflare IP Addresses

Official site: – (https://www.cloudflare.com) Edit nginx.conf copy and past this ip under http {

http{
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 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;

Finally save it and reboot nginx. Cloudflare explains this here and maintains an updated list of Cloudflare IP addresses here.

2)Incapsula IP Addresses

Official Site : – (http://www.incapsula.com/) Edit nginx.conf copy and past this ip under http {

http{
set_real_ip_from 199.83.128.0/21;
set_real_ip_from 198.143.32.0/19;
set_real_ip_from 149.126.72.0/21;
set_real_ip_from 103.28.248.0/22;
set_real_ip_from 45.64.64.0/22;
set_real_ip_from 185.11.124.0/22;
set_real_ip_from 192.230.64.0/18;
real_ip_header X-Forwarded-For;

Finally save it and reboot nginx. explains IP ranges from this link clickhere.