VirtualBox: No network connectivity. Weird vboxnetflt.ko/vboxnetadp.ko behaviour

Adam Vande More amvandemore at
Fri Nov 27 16:39:57 UTC 2009

On Fri, Nov 27, 2009 at 10:36 AM, Norbert Papke <npapke at> wrote:

> On November 27, 2009, O. Hartmann wrote:
> > Befor going deeper into my config I will report some strange behaviour
> > of needed kernel modules
> >
> > vboxnetflt.ko
> > vboxnetadp.ko
> >
> > Both are needed for networking on VirtualBox and they get loaded at
> > startup vi /boot/loader.conf. But to have a working network, I have to
> > unload and then reload them, since if they get loaded at startup,
> > networking is broken in virtual box!
> The vboxnetadp.ko is needed for the "host-only adapter" mode, I tend not to
> load it. For bridged mode, you need vboxnetflt.ko.
> I have been having good luck by always loading vboxnetadp.ko manually
> rather
> than from loader.conf.
> > My FreeBSD-based config is simple. I have a bridged NIC (msk0), a tap0
> > device which is member of the bridge.
> I do not use a tap device. It should not be needed.  I bridge the physical
> device directly.
> > Has anybody similar trouble?
> The modules are a somewhat temperamental.  When I follow the above, it
> works
> great.  When I deviate, I sometimes have trouble.
> Cheers,
Yeah I assume the issue is vboxnetflt.ko needs eth device to be loaded to
actually bind to.  I do this with /etc/crontab to work around:

@reboot                                 root    /sbin/kldload
Adam Vande More

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