Funky Firewall - Engineering Request

I have a problem and am wondering how the brightest Linux brains of
Phoenix would solve it.

Problem:
A certain web site that my family enjoys will not allow multiple
computers from the same IP address to use the site at the same time. I
currently have a Linux firewall with 2 NICs - one for the Internet and
one for my LAN running NAT so all of my systems have the same public IP
address.

Qwest allows me 4 IP addresses, and I would like to take advantage of
them so we can have more than one computer at the site at one time.


Problem Statement:
Build a firewall that:
1. Allows each computer on the LAN to send traffic out a different IP
address on the Internet side of the firewall.
2. Filters all outgoing traffic though DansGuardian/squid.

Essentially, each computer in the house would appear to have its own NAT
firewall, and I don't want to actually deploy 3 more hardware firewalls.


Random thoughts so far:
1. Set up box with 4 copies of VMWare running - each with a copy of the
existing firewall.

2. Set up usermode Linux and have each one run a firewall & proxy. I'm
pretty fuzzy on this stuff.

3. Bind multiple IP's to each NIC, and attempt to set up the iptables
script from hell.



Any input/suggestions/advice would be appreciated.

--
George Toft, CISSP, MSIS
AGD,LLC
www.agdllc.com
623-203-1760
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