Drupal appliance vhost configuration

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In the Drupal appliance http://pve.proxmox.com/wiki/Drupal where is the vhost configuration that Apache uses for the default Drupal site?

I am asking this because I am in the process of putting several virtual web-servers behind a reverse proxy as described here https://help.ubuntu.com/community/Nginx/ReverseProxy

The above howto says

mod_rpaf requires the following directives inside a vhost to work:

<IfModule mod_rpaf.c>
RPAFenable On
RPAFsethostname On
RPAFproxy_ips 172.27.0.1
</IfModule>

Where RPAFproxy_ips can be multiple IP addresses, one of which is our Nginx proxy private IP address.

Changing /etc/drupal/6/apache.conf did not do the trick, and I am reluctant to do too much trial and error. Any help is greatly appreciated.

Regards,
Bjørn Ingmar Berg