Because Cloudflare acts as a reverse proxy, Cloudflare IP addresses will now show up in your server logs, instead of the visitor IP address. If seeing the original visitor IP addresses is important to you, see Restoring visitor IP addresses.
If you are experiencing issues with GeoIP or .htaccess blocks not working properly on your site, installing mod_cloudflare will resolve the problem. Download the mod_cloudflare package at:https://www.cloudflare.com/resources-downloads#mod_cloudflare.
Note: This is not required if you created signed up through a Cloudflare Certified Partner.