open a terminal (as root) and type
ifconfig
it will give you your local ip address. Probably something like 192.168.X.X
X being some other number.
entering that into any of you local networked computers should give you the correct page.
on the local computer it should be
http://localhost.localdomain/
on your networked computers it would be
http://192.168.X.X Probably
As far as your router goes......... port 80 must be forwarded to your LOCAL ip address. Again, using ifconfig as root will give you that local ip address #
HTH's
Oh..... an external computer would use your ISP provided IP address......
IE something like:
http://12.216.132.167/
Your EXTERNAL IP can be obtained by browsing to
www.iowawebmasters.com