Firewall Appliance in Virtual Box

[mishra.sandip]

Dear All,


I have a current setup like this.

I have installed Virtual box on windows 7, where i have 3 VMx (Ubuntu,XP and win 7)

I want to install Firewall Appliance in between them to have a environment like DMZ.

Can anybuddy please help in where to get opensource firewall appliance and how to go ahead to achive this kind of setup.

many thanks in advance.

Regards
Sandip