Routing with 1 ethernet controller possible?

From: Mack Maverick (maverick_at_oak.rpg.pl)
Date: 09/30/05 

Date: Fri, 30 Sep 2005 11:37:15 +0200

I have a compact machine, which can be physically equipped with only one
ethernet controler (no usb-ethernet possible since it doesn't support
usb:). I'm thinking about converting it into a "home-use router/web
testing server" becouse it consumes the same amount of power as a
lightbulb :P

The question is - can I route the signal from my ISP using this machine
with one ethernet controller, a switch and miles of the ethernet cable?

i'd be grateful for any hint:)

MM