[support] How to confirm that Drupal is using reverse_proxy?

Hi All, I have nginx 0.7.6 in front of Drupal 6.3 in a test environment. I have edited settings.php: 'reverse_proxy' => TRUE, 'reverse_proxy_addresses' => array('192.168.2.179'), Where can I look to see a X-Forwarded-For address? I don't see it in the sessions table (hostname). I have tested with plain old PHP to confirm that my proxy setup is copesetic and written X-Forwarded-For into the apache log (i.e. %{X-Forwarded-For}i) but how do I confirm my proxy setup is working with Drupal? My apologies if this is obvious! But smite me with the answer! Cheers Jason