Need firewall suggestions

I need a firewall solution whether it be a software application,
hardware appliance, or even a separate computer. I will be at a
trade show and will be assigned two IP addresses for my internal
netwok of computers. Two different software programs will be
running on each of my computers. Each computer will have two
NICs, while one program communicates over broadcast traffic on
one NIC and the other program over multicast traffic on the
other NIC. In theory this will be two separate networks. My
dilemna is that both software programs need to be shared
externally through a firewall with broadcast traffic going out
one IP address and multicast traffic going out the other IP
address. I am trying to avoid using a separate computer
firewall for this purpose because I want to travel as lite as
possible. A firewall appliance would be ideal since I can reuse
this solution in the future however I do not believe that these
appliances can route multicast traffice. A software firewall
solution can get very cumbersome since I would have to configure
each firewall on each machine. Any suggestions on how to make
this work will help. Please chime in with your two cents.

.

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