On Mon, 19 Mar 2012 12:11:10 -0400, jammin2night wrote:
FreeBSD charon 9.0-STABLE FreeBSD 9.0-STABLE #14 r233107: Sun Mar 18
05:26:58 EDT 2012     root@charon:/usr/obj/usr/src/sys/CHARON  amd64

Hello:

I have a machine that has a 802.1q trunk attached which works fine.
I can create VLAN interfaces, apply an IP address to them and all is
good.

I have VirtualBox running on this machine and need to present an
interface to a VM that does not support trunking natively.  I've
googled and searched the archive trying to figure out how to create an
interface that VirtualBox will use where the 802.1Q tags are removed
but have not had any success.

If I understood you correctly, you want to bridge the interface without 802.1q, so the tag/untag would be done by the host machine?

If that's the case you can bridge the guest's virtual interface to the vlan interface, so the guest won't see the tags. You can't do with the VBox GUI, but the VBox TUI (VBoxManage ) is able to do what you want. Let's suppose you want to bridge the host's vlan10 interface with the first virtual interface of a virtual machine named "FreeBSD virtual machine" and let's suppose it will be a virtio interface:

VBoxManage modifyvm "FreeBSD virtual machine" --nic1 bridge --nictype bridge virtio --bridgeadapter vlan10

Actually I'm using this kind of setup with around 10 virtual machines, each one serving 5 vlans. It is a very flexible setup because the virtual machines don't need to worry about the physical segmentation of my network, but only the logical segmentation (at IP level).

  Gustau




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