A Dedicated Firewall/Router: Devil-Linux
Devil-Linux is a distribution which boots and runs completely from CD. The configuration can be saved to a floppy diskette or a USB pen drive. It was originally intended to be a dedicated firewall/router but now Devil-Linux can also be used as a server for many applications. Attaching an optional hard drive is easy, and many network services are included in the distribution.
The CD provides the operating system, and the floppy provides the configuration information via a tarball that is unpacked into the /etc directory. In this way, the system is fully configurable yet the running system has no writeable device.
Besides being used as a firewall/router, here is a list of other possible applications:
* Proxy Server
* DNS Server
* Mail Server with TLS support and Spam and Virus filtering
* HTTP Server
* FTP Server
* File Server
* VPNs with X.509 support
* DHCP Server
* NTP Server
* IDS Node
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