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my school had quite some old unused Barracuda NG Firewalls laying around… and I was tasked to re purpose them by installing a new OS to turn them into a general purpose server.
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the RS232 port was used to run a CLI = Command Line Interface installer booted from a flashed USB Stick
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the original Barracuda Bootloader (GRUB) was reused… and just it’s config changed to boot the newly installed Archlinux system