This tutorial will help you to enable Apache mod_cloudflare module on a Ubuntu system. Which will log the original visitor IP address to logs.

Install mod_cloudflare for Apache

Cloudflare provides an official module for the Apache server to capture real IP addresses. You need to enable the PPA of the Cloudflare module to your Ubuntu system.

Conclusion

In this tutorial, you have learned to configure the Cloudflare module to Apache on the Ubuntu system.

How To Install mod cloudflare for Apache on Ubuntu   TecAdmin - 32