I wanted to simulate a configuration consisting of a firewall with two network interfaces and a single client operating system. I chose pfSense for the firewall and Windows 7 Professional for the client.
I had to customize the pfSense virtual machine, since it needed to have two network interfaces. The first interface for the WAN would use NAT (Network Address Translation) to access the outside world. The second interface would use an internal network for communication between virtual machines. The Windows 7 guest would only have one interface on the internal only network and can access the internet through the firewall.
Installing pfSense was similar to Virtualbox, but Windows 7 was much easier. When I used the wizard to create the virtual machine, VMWare Worsktation identified the ISO image as Windows 7 x64.
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