lot's of firewall questions

From: Bryce (fukuzzz_at_takethisout.hotmail.com)
Date: 09/29/03 

Date: Mon, 29 Sep 2003 14:23:43 -0700

I made a little gif here showing a diagram of the setup I'm using.

I have a qwest dsl line coming in to a cisco 678 and then into a Linksys 8
port router.

http://64.45.4.179/temp/computer/computer-network.gif

The blue line indicates the cable that comunicates from #1 computer to the
router.

There are 8 computers all together. Is the firewall in the cisco or in the
LInksys? I don't understand. And how do I address the firewall?

I have a dynamic ip address for the cisco 678 that only changes if I reboot.

I'm getting a block of 5 ip address from qwest because I want to set up a
computer (#9) onto the network that can have it's own IP address and can
provide files and pictures for ebay etc (for my brother in Japan rather than
him paying some other company big bucks to host 3 gigs of files. I figure
that since I'm already paying for dsl, I might as well let him access them
here for just the 15 bucks a month fee of renting the ip address). I need to
add another 4-port to the 8-port to make room? But how do I make sure that
the rest of the world can never get to the first 8 computers and only the
9th one? Where do I begin? Can anyone help me?