[Xen-users] Re: Network isolation - PCI passthrough question

[Mike Fröhner <mikefroehner@xxxxxx>]

Am 20.12.2010 15:55, schrieb Jean Baptiste FAVRE:
> Le 20/12/2010 15:47, Mike Fröhner a écrit :
> > Am 20.12.2010 15:08, schrieb Jean Baptiste FAVRE:
> > > Hello,
> > > I thinking about using PCI passthrough to dedicated a domU as firewall.
> > >
> > > I understand PCI passthrough concept. When done, my domU will see
> > > network card and the dom0 won't any more. So I'll be able to filter all
> > > trafic from outside, since it will go through network domU.
> > >
> > > Then, how will I be able to connect other domU (and maybe dom0) to the
> > > network domU ?
> > >
> > > In a normal way, creating domU makes dom0 creating vif interfaces and
> > > bridge (in my configuration) it. But once netowkr will be isolated in a
> > > specific domU, dom0 won't be able to interact with it, will it ?
> > How many network cards do you have in this computer? I think you'll need
> > minimal 2 nics. One for dom0 and domU (vif) to communicate and one for
> > PCI passthrough. As you understood right, dom0 won't see the PCI
> > passthrought nic.
> > > Any link/help/explanation appreciated.
> > >
> > > Regards,
> > > JB
> Hello,
>
> For now, I have 2 nics within a bond interface.
> What I would like to achieve is to have a dedicated domU acting as
> firewall for all other domU like in Qubes-os project
> (http://qubes-os.org/Home.html).
> That means, I want to passthrough both nics to one domU called "netDomU"
> and connect all "regular" domU networks to "netDomU".
>
> But since dom0 won't see any network card, how can I create vif interfaces ?
If I understood right u want to simulate an office with different appVMs?

I think I got a solution for you:

The vif doesn't need a bridge from a real nic. You could also use a 
bridge on the lo-device for domU vifs.
There would be just one Problem. The dom0 wont be directly accessible 
because it does not have an ip address. Perhaps it is possible to create 
another bridge for communication to the firewall (if it is a router).
This is really crazy stuff :)

Regards,
Mike






> Regards,
> JB

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