General Apache / Squirrelmail / DSL Modem / Router Question

[Jim S. <ji...@mi...>]

I am trying to run squirrelmail on one of my home machines and be able 
to access it over the internet.  I have apache, squirrelmail, and 
cyrus-imap running on this computer.  I can access and use squirrelmail 
from any computer on my home computer.  From the internet, apache will 
serve static pages, but I can't use squirrelmail.  The browser just 
gives an error that it can't connect to the site.  I'm pretty sure this 
is just a basic configuration error.  Any suggestions or links to 
relevant information would be appreciated.  Here is more detail on my setup:

My home network consists of several computers linked by a Linksys switch 
/ DSL router.  The router is also connect to a DSL modem.  My local 
network addresses are in the range of 192.168.1.XXX.  The DSL address is 
66.149.8.8.  The router is configured to forward all relevant ports to 
one computer.  This computer is running apache, squirrelmail, and 
cyrus-imap.  I am getting confused as to when to use the 66.149.8.8 
address and when to use the 192.168.1.100 address (or the name shep.home 
as I have referenced in the hosts file) in the configuration files.  
Originally, I used shep.home in the apache and squirrelmail 
configurations, and they both worked well within my home network.  But 
when accessing from the internet, the browser would automatically change 
the address from 66.149.8.8 to shep.home, which would fail.  I changed 
the apache config file to reference 66.149.8.8 instead of shep.home, and 
that seems to have apache working correctly.  However, squirrelmail does 
not seem to be working and changing the configuration file to reference 
66.149.8.8 does not seem to work either.  So which address do I use in 
the apache and squirrelmail configuration files and are there any other 
changes I need to make to other config file (etc/hosts,...).

Thanks,
Jim Shepherd