PFSense - Install pfSense in VirtualBox

Download pfSense

Navigate to http://www.pfsense.org/ and click on the Download section.

NOTE: The options here are what I use.

Architecture: AMD64 (64-bit). As I use an AMD or Intel device as the router.
Installer: USB Memstick Installer. As I will install from a USB.
Console: VGA. As I will plug a Keyboard and Monitor into the router; and will not be setting this up via a Serial cable.

Choose different options as required.

Open Virtual box.
Click New to create a new machine.
Select Type BSD and version FreeBSD (64-bit).
Select your RAM, 512 MB minimum. If you are going to doing a lot with your router (e.g. running an IPS/IDS or VPN) provision more. 8 GB or more to allow a lot of functionality and support a lot of devices.
Provide the location of virtual hard disk location on your PC and select the hard drive file type VDI. 20 GB or more to allow for logs and additional packages.

Setup the network adapters. You need to bridge one adapter for your WAN, and bridge one adapter for your LAN. Remember which is which!

Select the Setting option.
Click on the Network option and in Adapter 1 select the option Attached to Bridge Adapter.
Now click on Adapter 2, and select the option Enable network Adapter and select the option Internal network.

Click on the Storage option from the cd menu select Choose a virtual CD/DVD option and point to the pfSense image file on your hard-disk.

Click on Start to power on the virtual box machine.
Select Option 1; Boot pfsense (default).
It will prompt you to create a Vlan. Select No and enter em0 as WAN interface name.
Select the option < Accept these settings >.
Select the option < Quick /Easy install > and click on OK.
The installation will start.

Select the Standard kernel option.
It will ask to reboot. Remove the Image file from the Device menu and reboot it.