Re: [Xen-users] Network issue in dom0

Hi Todd,

I just created a dummy interface and added it to a new bridge. Like this I can now access dom0 again from domU1 (which is the firewall/router) and vice versa. Respectifly I can access every machine in my different subnets and the internet fromdom0.

But: I still have the problem that the network goes down when transfering a lot of data. It's not as bad as before, since dom0 now has it's own newtorksegment - the rest of the network is no longer affected and the users can work normally. But it's still not possible to copy a lot of data. It's no difference whether I copy (wget) data from the internet or from another local machine (scp). And I still can't find any log entry...

What else can I try?

Thanks & regards,

Markus

----- Ursprüngliche Nachricht -----
Von: "Todd Deshane" <deshantm@xxxxxxxxx>
An: "Markus Gerber" <markus@xxxxxxxxxxxxx>
Gesendet: Dienstag, 29. Januar 2008 17.02 Uhr (GMT+0100) Europe/Berlin
Betreff: Re: [Xen-users] Network issue in dom0

Hi Markus,

You could setup a dummy device in dom0 and have it bridge with a private network of your domU1.

If you look back within the last week or so. I gave some basic instructions on how to do this. Let me/the list know if you run into problems or have further questions on that.

Regards,
Todd

On Jan 29, 2008 1:51 AM, Markus Gerber <markus@xxxxxxxxxxxxx> wrote:

Hi Todd,

The idea of this setup is that I do not want to provide any service in dom0.

In domU1 I have all the NICs in it, since it is the router/firewall. The other domUs are in different subnets and have therefore access to different NICs (there are other servers - in the respective subnet - that are connected to the server).

My main question is how to best access dom0...

Thanks and regards,

Markus

On 29.01.2008, at 05:32, Todd Deshane wrote:

On Jan 27, 2008 12:08 PM, Markus Gerber <markus@xxxxxxxxxxxxx> wrote:

Hello,

I have a network issue in dom0; I'm not sure if it's a configuration
problem or a design problem in my setup.

My setup:
The server (dom0) runs Ubuntu 7.10, Xen was installed using apt-get
(means version: Xen 3.10, Kernel 2.6.22-14). This server has 4 NICs. I
use bridged networking with my own script which creates 4 bridges
("$dir/network-bridge" "$g" vifnum=0 netdev=eth0 bridge=xenbr0 - this
line I use four times for each interface). This works great so far.
/etc/network/interfaces in dom0 brings only up eth2 with a static
address (10.10.1.2). domU1 acts as router/firewall and has all bridges
connected to it. And every ethX in domU1 has it's own subnet
(10.10.1.0/24 to 10.10.4.0/24). This works as well.

My problem:
Each time I download a lot of data (i.e. an apt-get upgrade which
upgrades the kernel) in dom0, the network in dom0 freezes.
Furthermore, the whole subnet 10.10.1.0/24 freezes. The network comes
back after a couple of minutes or after a couple of hours. This
varies. So far, I couldn't find any log, where I entry is made when
the network stalles.
I can't access any other net from within dom0 and dom0 can't be
accessed from any other place.

My question:
What could be the problem for this behaviour?
Is there a better way to access dom0 from within domU1 (or any other
domU)?

Thank you in advance for any tipps.

I don't have any ideas yet. What is the purpose of this setup though?

Regards,
Todd

Regards,
Markus
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