This HOWTO will explore the concepts and configurations for establishing a fully functional Internet connected network environment for your home or small office. This setup uses a dedicated Linux server as the gateway device to provide all of your network connections, Web / Email / FTP servers, packet filtering firewall, and most of the other services required to configure and secure a complete small scale network.
http://www.brennan.id.au
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http://www.linuxhomeserverguide.com
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http://www.brighthub.com/computing/linux/articles/25875.aspx