[Xen-users] Link bonding problem

["Matthew Law" <matt@xxxxxxxxxxxxxxxxxx>]

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.


Many thanks,

Matt.



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