jail/virtual servers and multiple network interfaces

[Jeffrey Williams <jeff@xxxxxxxxxxxxx>]

I regularly make use of jail in FreeBSD for hosting virtual servers 
(typically for application development and testing, and infrastructure 
server configuration testing).

One thing I have always found frustrating is the inability to set up a 
additional network interfaces on the machine so that they can be 
dedicated to the jailed servers, in such a way that all the host's 
network traffic stays on the primary interface, and all the jail's 
network traffic uses its own dedicated interface.  i.e. a virtual 
network stack, for the jailed server, that can be bound directly to a 
separate NIC than the one used by the host environment.

I did read a  2003 Usenix white paper by Marko Zec on this 
topic(http://www.usenix.org/events/usenix03/tech/freenix03/full_papers/zec/zec_html/index.html), 
but have not found any mature implementations.

Anyways, I was curious if this type of functionality is being 
implemented, or in consideration for implementation, in DragonFlyBSD?

Thanks
Jeffrey Williams