For anyone following along:

The firewall-computer also serves as a router.  Therefore, only a dumb
[cheap] hub needs to be hung from the firewall-computer's ethernet port so
all the users' computers can connect to it.

The speed of the microprocessor (uP) should corrolate to the number of
computers being fed by the firewall-router-computer.  I think I read that a
100 MHz Pentium 1 is fast enough to serve two computers.  I guess you can
keep an eye on the "Kernel Processor Usage (%)" to see if it's starting to
max out.

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Unanswered questions:

Shall I assume "two" ethernet cards? -- one to the internet connection, and
the other to the hub?  (The Guzzintta and the Guzzoutta.)

Are there little hub PCI cards (for the Guzzoutta)?  Just a few ports would
do me fine.

What are some firewall-router programs that are used in
dedicated-firewall-router computers?  Or is that all included in the Linux
OS?

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Same bat time, same bat channel.

-Neil-