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Sentry Firewall is a free open-source network firewall Linux distribution that was first published in 2001 and has been the subject of multiple magazine reviews.[1][2] The distribution is particularly notable because it consists solely of a bootable CD-ROM that is designed to be used in a computer with no hard disk. Configuration information is retrieved at boot time by automatically searching on an attached floppy disk drive, USB flash memory drive, or another server on the local network willing to provide the configuration.
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