Xen users - Nov 2008 - Bridged networking not working as expected

Hello list,

I am trying to connect 16 machines. I changed the loopback-values to
255.

If i now start all machines and try networking, about the half couldn''t
connect the internet but get an IP and can ping the dom0. So i decided
to seperate them into 4 bridges, so vm 0-3 are on bridge "cluster0",
4-7
are on "cluster1" and so on...

For that, i changed my xend-config.sxp:
#(network-script network-bridge)
(network-script network-bridge bridge=cluster0 vifnum=0)
(network-script network-bridge bridge=cluster1 vifnum=1)
(network-script network-bridge bridge=cluster2 vifnum=2)
(network-script network-bridge bridge=cluster3 vifnum=3)

But this didn''t work. Restart of xend did no error-messages, but
neither
did install four bridges. If i add "bridge=cluster0" to a virtual
machine and start it, i get the error that the bridge is missing.

So there are two main questions for me:

1. WHY is bridged networking only working for half of the vms''?
2. What''s the fault in my "bridge-multiply"-config?

Kind regards, Florian
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On Wed, Nov 12, 2008 at 5:38 AM, Rustedt, Florian
<Florian.Rustedt@smartnet.de> wrote:
> Hello list,
>
> I am trying to connect 16 machines. I changed the loopback-values to
> 255.
>
> If i now start all machines and try networking, about the half
couldn''t
> connect the internet but get an IP and can ping the dom0. So i decided
> to seperate them into 4 bridges, so vm 0-3 are on bridge
"cluster0", 4-7
> are on "cluster1" and so on...
>
> For that, i changed my xend-config.sxp:
> #(network-script network-bridge)
> (network-script network-bridge bridge=cluster0 vifnum=0)
> (network-script network-bridge bridge=cluster1 vifnum=1)
> (network-script network-bridge bridge=cluster2 vifnum=2)
> (network-script network-bridge bridge=cluster3 vifnum=3)
>
> But this didn''t work. Restart of xend did no error-messages, but
neither
> did install four bridges. If i add "bridge=cluster0" to a virtual
> machine and start it, i get the error that the bridge is missing.
>
> So there are two main questions for me:
>
> 1. WHY is bridged networking only working for half of the vms''?
Did you try this option specifically:
http://wiki.xensource.com/xenwiki/XenFaq#head-f904c830a208c4f3ed6d77acdf9fe5c323c4d43e
> 2. What''s the fault in my "bridge-multiply"-config?
Does this explanation help?
http://wiki.xensource.com/xenwiki/XenNetworking#head-7b845eda5e0154fecb98165adbd774f6168119d1

Cheers,
Todd

-- 
Todd Deshane
http://todddeshane.net
http://runningxen.com

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Hi again,
>-----Ursprüngliche Nachricht-----
>> 1. WHY is bridged networking only working for half of the
vms''?
>
>Did you try this option specifically:
>http://wiki.xensource.com/xenwiki/XenFaq#head-f904c830a208c4f3ed6d77acdf9fe5c323c4d43e
>
>> 2. What''s the fault in my "bridge-multiply"-config?
>
>Does this explanation help?
>http://wiki.xensource.com/xenwiki/XenNetworking#head-7b845eda5e0154fecb98165adbd774f6168119d1
I know both ressources and did read them multiple times till now.
The second link uses one bridge per physical interface, but i want ot build
multiple bridges for the SAME physical interface to help around the problem of
question 1...

As i said, what i absolutely not understand is, that all virtual interfaces in
the vms (always eth0, always a different MAC and IP) can ping the physical IP of
dom0, 192.168.10.10
The VMs are all in the same net, from 192.168.10.100 up to 192.168.100.115.
And some of them can reach the internet, some not?!

Florian
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