Server IP Problem

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I put Cloudflare on my system, but it’s playing the role of a "reverse proxy on account of CDN’s DNS".

But when I give one ping -t meusiteaqui.com it returns the real IP address of the server, but in request it is with the Cloudflare proxy.

php apache server ip

1 answer

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Since Cloudflare is acting as proxy, the IP of the user accessing the page is overridden by the Cloudflare IP.

Of Stack Overflow in English (free translation with some modifications):

Extra server variables available from Cloudflare for these purposes are:

  • $_SERVER["HTTP_CF_CONNECTING_IP"] Actual IP of the user (That’s what you want);
  • $_SERVER["HTTP_CF_IPCOUNTRY"] user’s country;
  • $_SERVER["HTTP_CF_RAY"] ⇒ learn more here;
  • $_SERVER["HTTP_CF_VISITOR"] helps determine if the protocol is http or https.

You can then use like this:

if (isset($_SERVER["HTTP_CF_CONNECTING_IP"])) {
  $_SERVER['REMOTE_ADDR'] = $_SERVER["HTTP_CF_CONNECTING_IP"];
}

Or directly access:

$_SERVER["HTTP_CF_CONNECTING_IP"]

Note that if you do this, it is important to check that $_SERVER["REMOTE_ADDR"] contains the true Cloudflare IP, as anyone can modify the header if they are able to connect directly to the server IP.

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