I run apache2 on my home network. I don't want apache2 to accept requests
from outside this network. However, not all the machines in the network are
switched on at any given moment.

I have Listen 127.0.0.1:80, which is fine for the machine that runs apache2,
but if I add the address of a machine that is not actually on, apache2
won't start.

How do I configure apache2 so that, other machines will be listened to, when
switched on, without my having to reconfigure and restart each time? Or am
I misunderstanding what's involved?

- Richard.