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Sentry Firewall
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.〔Linux Journal Magazine, ("Focus on Software, Security Applications" )〕〔(Linux Magazine ), "Sentry Firewall CD - Simple Safety", May 2004 issue, page 56 (print only)〕 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.
== Overview ==
Sentry Firewall starts from CD-ROM and immediately constructs a RAM disk in the computer's memory. Before the system fully boots, a script searches for removable media containing a file called "sentry.conf". If that file is found, it may contain detailed instructions and a list of files to be copied from the removable media to the RAM disk before the system is finally allowed to boot.
The CD-ROM is pre-loaded with a variety of configurable network tools, including iptables.
Because the RAM disk is created each time the machine boots, it is possible to recover from any sort of problem simply by rebooting the machine. From a security perspective, this is compelling because the machine essentially becomes immune to viruses or file corruption - or at least the effects of either problem can't survive a reboot.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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