[Koha] Apache Default Page

[Lawrence Bean]

I posted this problem to the list last May, and someone *must* have helped
me solve it because I had this working for the last nine months. I had to
migrate to new hardware and the same puzzle has resurfaced. I checked the
archives, but cannot find the helpful reply anywhere so I assume the
respondent must have re'd me only. I simply cannot remember what the fix
was, so I post it again in hopes the answer may appear once more.

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Hello folks. I just successfully finished setting up KoHa
on a Macintosh running 10.4 Tiger. 

When at the koha computer, I open a web page and type
http://localhost
and up pops the opac main page just like it should.

However, accessing from a remote machine with
http://172.16.1.11
brings up the Apache default page.

To test locally, I went to the koha machine and double-checked the IP
address, which is correctly 172.16.1.11, then tried 
http://172.16.1.11
right at the koha machine, and up came the Apache default page.

Switching to the loopback IP, though,
http://127.0.0.1
brings up KoHa.

I even tried:
http://172.16.1.11/cgi-bin/koha/opac-main.pl
at the koha machine and got the "Not Found" response.

So, it seems there is a setting in Apache that I missed. Any help, or
pointing me in the right direction to help myself, would be greatly
appreciated.