Damn. This just took me 8 hours.
My system is a supermicro H8DGU-F which uses an Intel 82576 Gigabit NIC.

In my case there are two problems. 
- Firstly, the igb network driver supplied by the xen kernel 
(2.6.32-5-xen-amd64) isn't up-to-date. So I compiled it from source
  http://downloadcenter.intel.com/Default.aspx?lang=eng

- Secondly, the driver isn't inserted (in time) during boot, so I
followed Andy Whitcroft's advise by putting the module (igb) into
/etc/modules.

This did the trick.. Funny thing is. You would expect this behaviour
also in the NON xen kernel (2.6.32-5-amd64) but this isn't true. Which
makes me believe some drivers from xen kernel differ from regular kernel
drivers. I wonder why?

Hope this helps..
Please let me know.

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https://bugs.launchpad.net/bugs/688703

Title:
  [lucid] netxen_nic driver and ethernet bonding broken at boot time

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