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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 09:32:57 -0400
Cc: Xen-users@xxxxxxxxxxxxxxxxxxx
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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 the /etc/xen/scripts/network-bridge script is obsolete ?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:

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.

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.


> 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
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Todd Deshane

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