I have a dual-homed FreeBSD 9.0 machine that itself only uses one NIC. Until today, I have left the second NIC unconfigured. Now I have installed Virtualbox on the FreeBSD host, and want to assign a particular Window guest two NICs, including dedicated access to this second, previously unused NIC. Within VirtualBox, I know this is a matter of selecting "Bridged Adapter" and pointing VirtualBox to the second NIC. What is unclear is how do I configure the second NIC on the FreeBSD host, so that the NIC is up and available for Virtualbox guests, without having TCP/IP properties or being connectable by/to the host. With Hyper-V or VMware on Windows, this is simple a matter of enabling the NIC on the host machine, and then accessing the NIC's properties on the host machine, and then unchecking all the connection items (e.g, Client for Microsoft Networks, QoS Packet Scheduler, File and Print Sharing TCP/IPv4, TCP/IPv6, etc). I am still new to FreeBSD and am not sure how to achieve the equivalent result editing by the /etc/rc.conf (or whatever other file). Any help is appreciated. Thanks in advance.