From owner-freebsd-hackers@FreeBSD.ORG  Thu Mar  6 06:22:19 2014
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Date: Wed, 05 Mar 2014 22:22:08 -0800
From: Julian Elischer <julian@freebsd.org>
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To: Joe Nosay <superbisquit@gmail.com>,
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Subject: Re: How do I create a cloned interface when there is no static
 connection?
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On 3/5/14, 3:30 PM, Joe Nosay wrote:
> I'm thinking that I may need to setup a script to create the interface and
> then bridge it so that the jail can connect to the internet.
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not sure I understand the question..

you can create all sorts of 'dummy' interfaces to pass to the jail.. 
is it a vimage jail or just using aliases?