sudo nano /override/classes/Tools

cloudflare-prestashop

 /**
    * Get the server variable REMOTE_ADDR, or the first ip of HTTP_X_FORWARDED_FOR (when using proxy)
    *
    * @return string $remote_addr ip of client
    */
    public static function getRemoteAddr()
    {
        if (function_exists('apache_request_headers')) {
            $headers = apache_request_headers();
        } else {
            $headers = $_SERVER;
        }

        // CloudFlare support
        if (array_key_exists('HTTP_CF_CONNECTING_IP', $headers)) {
            // Validate IP address (IPv4/IPv6)
            if (filter_var($headers['HTTP_CF_CONNECTING_IP'], FILTER_VALIDATE_IP)) {
                return $headers['HTTP_CF_CONNECTING_IP'];
            }
        }

        if (array_key_exists('X-Forwarded-For', $headers)) {
            $_SERVER['HTTP_X_FORWARDED_FOR'] = $headers['X-Forwarded-For'];
        }

        if (isset($_SERVER['HTTP_X_FORWARDED_FOR']) && $_SERVER['HTTP_X_FORWARDED_FOR'] && (!isset($_SERVER['REMOTE_ADDR'])
            || preg_match('/^127\..*/i', trim($_SERVER['REMOTE_ADDR'])) || preg_match('/^172\.16.*/i', trim($_SERVER['REMOTE_ADDR']))
            || preg_match('/^192\.168\.*/i', trim($_SERVER['REMOTE_ADDR'])) || preg_match('/^10\..*/i', trim($_SERVER['REMOTE_ADDR'])))) {
            if (strpos($_SERVER['HTTP_X_FORWARDED_FOR'], ',')) {
                $ips = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
                return $ips[0];
            } else {
                return $_SERVER['HTTP_X_FORWARDED_FOR'];
            }
        } else {
            return $_SERVER['REMOTE_ADDR'];
        }
    }