When you install varnish-cache on your server, you will notice that the IP your backend receives is always your localhost (IPv4 127.0.0.1, IPv6 ::1).

That’s a problem for different cases:

1. The log doesn’t contain IP information (e.g. if you use an analytic tool like webalizer that scans the log for unique users)
2. Local statistic tools (like piwik) gets confused
3. You can’t use the PHP variable $_SERVER[‚REMOTE_ADDR‘] because it always returns 127.0.0.1

To fix this here’s the solution for apache and nginx webservers:

(mehr …)