Re: [Xen-users] How to Use Xen with eth1?[Scanned]

[Chris Bradford <chrisbradford@xxxxxxxxxxxxxxxxxxxx>]

Henning Sprang wrote:
> Hi,
>
> On 8/14/06, Chris Bradford <chrisbradford@xxxxxxxxxxxxxxxxxxxx> wrote:
> > [...]
> > I had to use eth0 as the network interface on the xen0 machine, 
> > otherwise the xenU
> > machine would not find the ftp server to install from.
> What do you mean by "I had to use eth0 as the network interface on the
> xen0 machine"?
> I don't understand your network setup - can you describe it a bit better?
>
> The only thing I understood from your description is that you where
> using bridged networking, and you configured the network-script to
> connect eth1 on the dom0 to the bridge, instead of connecting eth0 to
> this bridge.
>
> > [...]
> > Is there a simple way to get the xenU install process to use eth1?
> xen as it is provided by xensource doesn't come with any install
> process for domU's, and so you can't make this process to "use" eth1.
> So what install process are you using? The Fedora-specific domU
> install script? (something *.py)
> If so, you might ask on the fedora-xen mailing list, they might know
> much better how this works and how to fix errors with it.
>
> > Or to get xen to use eth1 for all xenU clients?
> A xenU instance never "uses" the eth1 from you dom0, at best you would
> make the xenU use one interface from your real hardwrae directly with
> pci-passthrough, but it doesn't seem like this is what you are about
> to do here. Apart from that, domU instances only get virtual network
> interfaces.
> Please read the xen wiki page "XenNetworking" to learn about how xen
> networking works, I think this will help you better understand the
> whole context in the first place.
>
> I am not sure how these fedora install scripts work, but normally, if
> you configured xend to use eth1 for the bridge, all domU's get
> connected to the same bridge, and should have the same problems as
> well as success for outside network connections.
>
> Henning
>
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Henning,

Sorry for the lack of clarity.

I have two NIC's in the host machine (xen0 kernel)

eth1 is in use and eth0 is not in use due to the fact that eth1 is a 
10/100/1000 NIC and eth0 is only 10/100.
When I installed the first  guest  machine (xenU  kernel)  I had lots of 
problems with network connectivity; i.e the guest OS could not obtain an 
IP address.
When I set eth0 as my primary interface and rebooted the guest OS was 
able to find an IP address. So I configured the guest whilst the host 
was using this card. After finishing the setup of the host OS I switched 
back to eth1 as the primary card after looking through the xen config 
files as described in my first post. After a reboot the bridge was 
configured to use eth1 and everything worked fine.
I went to setup a second host a few days later and had exactly the same 
problems again.
I am certain that the virtual interface is bridged with eth1 but the 
guest OS seems to ignore this and wants to use a bridge with eth0. This 
is fine in a testing environment, but I can't swap interfaces when this 
machine is live along with all the hosts.
I'll ask on the fedora-xen list as I am using the FC5 install script for 
guest operating systems.
Many thanks for your reply,

-Chris


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