Sentry Firewall  From Wikipedia, the free encyclopedia Jump to:
navigation, search  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.   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