If you have an old PC, even a 386-based PC, with just 12 MB of memory and a floppy drive, you have enough to build a firewall for home use or for use by a small business. You can build your firewall with such minimal hardware requirements if you use floppyfw. In fact, you can get by with even less than 12 MB of memory if you use an older version of floppyfw, i.e. the 1.x series rather than the current 2.x software. And the old 1.x software is still maintained by the developer.
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