Problem with split dns?

[ekkljs]

To access internal Web servers from internal network, I use split DNS using a hosts file.

In that internal network, there is a Varnish server which acts as cache and reserve proxy. I can check its working by checking http header response.

HTTP/1.1 200 OK
Date: Wed, 15 Jun 2016 22:28:58 GMT
Expires: Sun, 19 Nov 1978 05:00:00 GMT
Cache-Control: public, max-age=43200
Content-Language: en
Etag: "1466029738-0"
Last-Modified: Wed, 15 Jun 2016 22:28:58 GMT
Vary: Cookie
Access-Control-Allow-Origin: *
Content-Type: text/html; charset=utf-8
X-Varnish: 360929 65936
Age: 11318
Via: 1.1 varnish-v4
X-Cache: HIT
X-Cache-Hits: 2
Content-Length: 55245
Connection: keep-alive

However when I try to check its working from internal network, I can see following message instead.

HTTP/1.1 200 OK
Date: Thu, 16 Jun 2016 01:38:16 GMT
Server: Apache/2.2.15 (CentOS)
X-Powered-By: PHP/5.6.21
X-Drupal-Cache: MISS
Expires: Sun, 19 Nov 1978 05:00:00 GMT
Cache-Control: public, max-age=43200
Content-Language: en
Link: ; rel="shortlink",; rel="canonical"
X-Generator: Drupal 7 (http://drupal.org)
Etag: "1466041096-0"
Last-Modified: Thu, 16 Jun 2016 01:38:16 GMT
Vary: Cookie
Access-Control-Allow-Origin: *
Connection: close
Content-Type: text/html; charset=utf-8

Always sees connection close and no varnish server info. So it's hard to check its health from internal network. Any fix?

[cmb]

Fix your split DNS to point to Varnish, not directly to the back end server.

[ekkljs]

Thank you!