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Re: [Xen-users] Xen 4.1.0, multiple network interfaces, network-bridge f

To: Jan Vejvalka <jan.vejvalka@xxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] Xen 4.1.0, multiple network interfaces, network-bridge failing to create multiple bridges
From: Todd Deshane <todd.deshane@xxxxxxx>
Date: Thu, 5 May 2011 09:54:36 -0400
Cc: Xen-users@xxxxxxxxxxxxxxxxxxx
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On Thu, May 5, 2011 at 9:32 AM, Todd Deshane <todd.deshane@xxxxxxx> wrote:
> On Thu, May 5, 2011 at 4:49 AM, Jan Vejvalka
> <jan.vejvalka@xxxxxxxxxxxxxxx> wrote:
>>>> root@cen:~# /etc/xen/scripts/network-bridge start netdev=eth0
>>>> root@cen:~# /etc/xen/scripts/network-bridge start netdev=eth1
>>>> only creates the eth0 bridge.
>>>> There is a check in the script that prevents it from creating more than
>>>> one bridge:
>>>> (...)
>>>> op_start () {
>>>> (...)
>>>>   if [ `brctl show | wc -l` != 1 ]; then
>>>>        return
>>>>   fi
>>>> Why ? Is that a bug, a feature, or is it something that came in in the
>>>> process of building Xen ? Did I miss something somewhere ?
>>> Networking in Xen 4.1+ has changed:
>>> http://wiki.xensource.com/xenwiki/MigrationGuideToXen4.1%2B
>>> See also:
>>> http://wiki.xensource.com/xenwiki/HostConfiguration/Networking
>>> http://wiki.xensource.com/xenwiki/Xen4.1
>> I see. But I did not upgrade, I installed from fresh. Does it mean that
>> the /etc/xen/scripts/network-bridge script is obsolete ?
> Yes it is deprecated. It will be much better and more robust to use
> the network scripts in your distribution.
> Offhand I can't seem to find the slackware documentation on creating
> network bridges.
> The closest thing I can find is:
> http://www.slackbook.org/html/book.html#NETWORK-CONFIGURATION-TCPIP-CONF
> Maybe other Xen Slackware users will have some tips?
> I've asked on the ##slackware IRC channel on freenode and if someone
> answers I can post more info.

So some responses from the slackware IRC indicate that brctl is in
fact a good option and you could put the commands in /etc/rc.local

Another person added a diff to rc.inet1 that support bridges:


Hope that helps.

If we could document a Slackware bridging guide somewhere guide on the
wiki that would be helpful for the future.


> A more manual option is to use a tool called brctl (using in a package
> called something like bridge-utils)
> brctl can be used to add a bridge device and connect it to your
> network card (eth0 for example).
> brctl is well-documented.
> Let us know if you find good slackware documentation for bridged
> networking so we can add it to our wiki.
> Thanks,
> Todd
>> Is there some info/example on how to set up networking in Xen 4.1 that
>> is not distribution-specific ? So far, the most helpful for me was the
>> diagram in http://libvirt.org/archnetwork.html together with the
>> network-bridge script itself.
>> And one more question: how can I tell which document in xenwiki applies
>> to which version of Xen ?
>> Thanks,
>> Jan
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen-users
> --
> Todd Deshane
> http://www.linkedin.com/in/deshantm
> http://www.xen.org/products/cloudxen.html
> http://runningxen.com/

Todd Deshane

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