From owner-freebsd-net@FreeBSD.ORG  Wed Mar 14 13:06:42 2012
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Date: Wed, 14 Mar 2012 14:06:39 +0100
From: Florian Smeets <flo@freebsd.org>
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To: MIHIRA Sanpei Yoshiro <sanpei@sanpei.org>
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Cc: freebsd-net@freebsd.org, freebsd-emulation@freebsd.org,
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Subject: Re: if_bridge stops when running virtualbox 4.1.8
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On 14.03.2012 13:59, MIHIRA Sanpei Yoshiro wrote:
> Hi,
>
> I also have this problem.
> My environment is below
>    - FreeBSD-8.2-RELEASE/amd64 and FreeBSD-10-current/i386
>      - Virtualbox 4.0.14(now I'm compiling new version 4.1.8)
>      - WI-FI HOSTAP mode(if_bridge)
>
> I hope to use both function(VirtualBox and if_bridge) at same.
> Please let us to know the appropriate settings.
>
>> I just noticed that when running Virtualbox 4.1.8 with a bridged network
>> interface, I loose connectivity to another virtual host running in qemu
>> whose network interface is bridged to my ethernet interface.  After
>> stopping the Virtualbox instance, I regain connection to the virtual
>> host under qemu.  Ifconfig doesn't give a clue.  Has anyone seen this
>> behaviour or, even better, have a solution?
>

What i did was create another tap interface add that to the bridge and 
configure VirtualBox to use the tap interface. Seems to work for me.

HTH,
Florian