Re: [Xen-users] Emulating Multiple NIC cards on Guests

[Sadique Puthen <sputhenp@xxxxxxxxxx>]

Ian Marlier wrote:
> On 2/12/08 7:26 AM, "Viswanath T K" <viswanath.t@xxxxxxxxxxx> wrote:
>
>   
> > Hi 
> >
> > I tried out whatever you have and others have suggested but nothing has
> > worked out yet.
> >
> > I shall elaborate on the steps I have undertaken on Fedora x86 64bit.
> >
> > 1.  Installed xen, kernel-xen , virt-manager
> > 2.  Rebooted on xen kernel.
> > 3.  I have 3 NIC cards and for all of them I have assigned Static IPs.
> > 4.  When I do an ifconfig I get details of eth0,1,2 ,lo and virbr0. I
> > dont see xenbr0.
> > 5.  Are virbr0 & xenbr0 the same ?
> > 6.  I dont see any file in /etc/xen/<guest name> so as to add vif=[], Is
> > this file auto-generated when we create a guest using virt-manager.
> >
> > 7.  I created a file in /etc/xen/<guest name> named guest1 and edited
> > vif as you have mentioned and created guest using "xm create -c <guest
> > name>
> > This also failed giving the error, "Device 0  cannot be connected.Hot
> > plug scripts failed ( I dont remember the exact error )"
> >
> > Help is needed on this.
> >
> >
> > Thanks
> > Viswanath 
> >     
> Have you gotten to the point that you have multiple bridges configured?
>
> `ip addr`, or `ifconfig`, should show you three bridges -- without them,
> you're not going to be able to create the three interfaces.
>
> I run on opensuse, not Fedora, but I think it's a fair bet that virbr0 and
> xenbr0 are two names for the same thing. 
Nops, xenbr0 is the bridge device to which you bridge peth0 (which is 
the renamed name for eth0) and vif<domid>.x interfaces.  So this means 
that a client connected to xenbr0 can directly connect to the external 
network.
virbr0 bridge just includes only the vif<domid>.x  from all guests 
bridged to it. So it can't connect to the external network unless you 
enable natting  and IP forwarding in Dom0.
Both xenbr0 and virbr0 is to enable virtual networking for guests, but 
using slightly different methods.
--Sadique
>  Taking a look at the
> network-bridge script in /etc/xen/scripts/ will tell you, I think.
>
>
>
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>   

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