How do I configure an Intranet?

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http://forums.fedoraforum.org – Hi, I have searched this forum as well as the web, without luck, to find a detailed guide on how to configure an Intranet on a linux server. I hope to be able to get some help from you folks. Current network topology: Approximately 15 computers connected to the network (majority is Windows XP, three Linux (2 Fedora 11 & 1 F12). We also have some visitors who can connect wireless) Internet connection is ADSL, and the router assigns the IP addresses via DHCP. We have a Linux Server (based upon Fedora 12) which serve a couple of tasks, i.e. a SAMBA repository, a CRM system and a CMS as well. These applications are accessable from all computers connected to the network. This is working very well, however there is a minor issue... Access to the server is done with IP numbers! The server has a static IP address defined in the router, but that is just not good enough any more. What I would like to accomplish is to configure an Intranet, which shall only be accessable from within the office, i.e. no access shall be possible from the internet into the Intranet. So the simple question is; How do I do this? - I would love a step-by-step guide! Just to make the task a little more complex, we have a domain on a webhotel. Is it possible to "name" the intranet like this: "intranet.domain.com", where we get routed to the public webhotel as usual when entering the address "www.domain.com", but when we enter "intranet.domain.com" we shall get routed to our own intranet web server. It shall not be possible to access "intranet.domain.com" from outside, i.e. from the internet. How do I do this? I'm quite comfortable installing and configuring linux applications including modifying the scripts. But I lack this networking knowledge, so I'm grateful if you can help. (HowTos)