Re: [Xen-users] Link bonding problem

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, Mar 22, 2010 at 12:39:20PM -0000, Matthew Law wrote:
> I have been trying to convert an existing CentOS 5.4 / Gitco Xen 3.4.1 box
> to use bonded interfaces and have run into some problems.
> 
> Before the change the box was a fairly standard config and had 2 x NICs,
> with eth0 being used by the Xen  network-bridge script.  I wanted to add a
> dual port NIC card and create two bonded interfaces:
> 
> bond0 (storage and management): eth0, eth1
> 
> bond1 (public interface): eth2, eth3
> 
> I shutdown the box, added the card and brought it up in with the normal,
> non-xen kernel in single user mode.  I added the bonds to modules.conf,
> added the interface and bond configs as required.  I opted to reboot and
> go back into a non-Xen kernel and test out the bonds in runlevel 2 - all
> working and no errors.
> 
> I edited the xend-config.sxp file and changed this line:
> 
> (network-script 'network-bridge netdev=eth0 antispoof=yes')
> 
> to this:
> 
> (network-script 'network-bridge netdev=bond1 antispoof=yes')
> 
> I then rebooted into the Xen dom0 kernel.
> 
> I immediately started to see errors regarding the bonds.  Something along
> the lines of "MAC address already in use".  After googling I saw this was
> an issue in the past but not any more in CentOS 5.4 with Xen 3.4.1.  The
> domUs started OK, but were not bridged to the external network (I could
> ping the dom0 address and other domUs, but the network gateway was
> unreachable).
> 
> I tried various things to no avail, so I removed the bonds and simply set
> the network-bridge script to use eth3 (this was the easiest thing to do
> since I had already changed the switches over and didn't want to remove
> the network card I had installed).
> 
> Can anybody give me some pointers as to what the issue is and how to
> resolve it? - I currently use antispoofing with iptables and ebtables
> which is driven by the xen scripts, so I would prefer to keep that feature
> regardless of how the bonds are handled.
> 
> 

I prefer disabling Xen network-script from xend-config.sxp (comment out the 
line),
and then set up the bonds/bridges using the distro default 
/etc/sysconfig/network-scripts/ifcfg* scripts.

-- Pasi


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