[Cialug] DNS-related Question

[Stuart Thiessen]

I'm doing some googling on this topic, but wanted to run this use case  
past the group to see if you had any ideas.

We are using OpenGoo to serve as a master project management service  
on our intranet. Apparently, the authors of OpenGoo have configured  
OpenGoo so you have to hardcode a root URL. Now, most of the time, we  
want to access it through our intranet, but we have configured our  
router so that our home IP's have permission to connect to our  
intranet server to access OpenGoo. But the problem is that I am not  
sure how set things up so that I can set up a URL like my-domain.com  
such that when we are in the office, the computer knows it is a LAN  
IP, but when we are at home, it is our office's public IP. OpenGoo  
wants one URL to insert. I learned this the hard way when I hard coded  
the IP address as the root URL. When we connect to the server, we  
can't get past the login because it is returning a local IP address as  
part of the web address which cannot be resolved over the Internet.  
(Make sense what I am explaining?)

One idea I had was to set up a subdomain based on our website that  
points to our public IP. Then try to figure out how to set up and  
configure a LAN DNS server that our office computers use and use that  
DNS server to intercept our request for the subdomain and substitute a  
LAN address instead of the actual public IP address. But I don't want  
it mess up any other subdomain for our domain (www, mail, etc.) But  
that seems overkill for one IP address. Is there a simpler way?  All  
of the clients are running Mac OS X. The server is running Ubuntu 9.04.

Thanks,

Stuart