Re: [Xen-users] Still confused about bridging (I think)

[David Dyer-Bennet <dd-b@xxxxxxxx>]

Javier Guerra wrote:
> On Fri, Sep 19, 2008 at 5:42 PM, David Dyer-Bennet <dd-b@xxxxxxxx> wrote:
>   
> > I know I'm confused about *something*, because packets aren't getting
> > through.
> >
> > The hardware has two NICs, eth0 connects to the corporate lan on
> > 192.168.1.14, and to a private cluster lan on 172.17.0.1.
> >
> > In dom0, I can reach systems on both lans.
> >
> > In a guest on 172.17.1.2, I can't reach anything.  Nothing in 172.17,
> > nothing in 192.168.1.  The guest is domain 9, called vl01.
> >
> > In dom0 A bridge, xenbr0 (specified in my control files for the domains),
> > is set up to let everybody talk to everywhere.
> >
> > [root@prcapp02 xen]# brctl show
> > bridge name     bridge id               STP enabled     interfaces
> > virbr0          8000.000000000000       yes
> > xenbr0          8000.2ed4b2e93fd1       no              vif9.0
> >                                                        vif7.0
> >                                                        tap0
> >                                                        peth0
> >                                                        vif0.0
> >     
> where's the 'way out' from xenbr0? IOW, is peth0 connected to a real NIC?
>   
Yes, that's the "real" nic.  Xen seems to have renamed the interfaces.

> i think you should set two bridges, one connected to eth0
> (192.168.1.14) , and the other to eth1 (172.17.0.1), then if you want
> a DomU on 172.17.x.x, connect it's vif to the second bridge.
>   
A bridge is a MAC-layer device, it never even looks at the IP address in 
the packet (the packet need not, in fact, be IP at all).  So I'd need a 
pretty detailed explanation of how this might help before it's even 
worth trying.
--
David Dyer-Bennet, dd-b@xxxxxxxx; http://dd-b.net/
Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/
Photos: http://dd-b.net/photography/gallery/
Dragaera: http://dragaera.info


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