One IP for multiple machines

[richb at pioneer.ci.net (Rich Braun)]

I'm looking for suggestions on using my Linux box as a LAN network address
translator for one of those cable-modem services.

Typically, those services give you only one IP address unless you're
willing to pay business rates (as a former ISP, I have first-hand
experience with how much higher those are!)  I have a couple of
Windoze boxes which I use for browsing & telnet.  There are commercial
products like Instant Internet and Firefox for setting up a LAN full of
PC's with a single IP address, but none of them are priced for home use.

I'm wondering if there's a way to set up a set of pseudo-addresses behind
a Linux firewall, or a tunneling method like PPTP or something like that
to allow the PC's to use a cable-modem service.

-rich