Use mod_rewrite to redirect traffic to web server on the internal net

I have a FreeBSD machine acting as NAT/web/mail server and a couple of machines on the internal network. One of them is Mac OS X 10.5 Server running Apache 2.2 with load balancer and reverse proxy which I would like to use to deploy ruby on rails aplication.

The OSX machine has internal IP address 192.168.168.237, mongrel is started with 4 instances on ports 3000-3003 and apache load balancer pointed to 4 instances. It works great on the local network.

I would like to use mod_rewrite on the NAT server to redirect communication to the OSX server so:

jobs.example.com points to the web server running on 192.168.168.237 and is accessible from the internet. Enclosed is my apache virtual server settings.

When I use the jobs.example.com address in the browser, it shows the rails application, but when I attempt to login, it _switches_ to internal network:

http://jobs.example.com/login ------> http://192.168.168.237/projects/show/

Does anybody have an idea how to get it to work?Start Free Trial

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<VirtualHost *>
 ServerName jobs.example.com
       <IfModule mod_rewrite.c>
                RewriteEngine On
                RewriteCond %{HTTP_HOST} jobs.example.com
                RewriteRule ^/(.*) http://192.168.168.237/$1 [QSA,P,L]
        </IfModule>
 
</VirtualHost>