Hello
First of all you need to understand networking
your router can point to your iis for the www service if you are running any web server there you just don't want to have your router do any port-forwarding to the sme web server
To access your intranet web server - in home web server on your sme just
http://it's-ip-number/ hit enter you should see the not customized page
To run both www servers on the INTERNET you need 2 ip addresses because there are 2 computers using port 80 or you can set one or the other computers to answer to a different port
You need to understand how to setup iis or apache web server
I have experience in both but this is an sme forum not iis or apache
You can get your sme server running and just test away it will not make any difference to your network you just use the computer ip address to connect you can also use it's hostname if you have it setup
http://ip-addressftp://ip-addresshttp://hostnameftp://hostnameYou will find out you need to learn alot about linux but it does not take much to run an sme box all of the hard work has been done iis has no mail server ftp server webmail server and is more complex when you need to do advanced tasks
a good iis box with www mail ftp $4000.00
a great sme box with www mail ftp $ .30 worth of bandwidth