I'm a resident of Utah, USA. I own three houses, one for each of my three wives / families. Each house is connected to the Internet through a cable modem and a LinkSys router. I'm interested in creating an intranet site which will be shared across each of my three houses, but will not be accessible from the outside. Any suggestions on how to do this? I'm interested in using only free and open source software.
Also if I have a computer in one house sharing files, I would like for a computer in another house to be able to access those files through a local IP address. Thanks!