Build a Floppy Firewall

    Date26 Feb 2001
    CategoryFirewalls
    5098
    Posted ByAnthony Pell
    Here's how I turned an unused PC into a packet-filtering firewall using a package called floppyfw. The firewall boots off a single floppy, runs completely in RAM, and uses ipchains for the filter rules. It also does IP masquerading, port forwarding, . . . Here's how I turned an unused PC into a packet-filtering firewall using a package called floppyfw. The firewall boots off a single floppy, runs completely in RAM, and uses ipchains for the filter rules. It also does IP masquerading, port forwarding, and can log to a remote host using syslog. All this in a machine with as little as 8 MB of RAM and no hard drive!

    floppyfw's author, Thomas Lundquist, describes it as a Linux "screening router with firewall capabilities". It boots a Linux kernel and comes with a minimal set of tools to get the job done. If you think about it, that's actually a feature. If a bad guy were to get into your firewall machine somehow, there won't be much for him to use against you. And since we're running completely on a RAM disk, a simple reboot from the floppy will restore the system to its original state.

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