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domU works fine the first time.

After reboot, eth0 doesn't exist. The xen virtual interface appears as eth1.

After a second reboot, the interface appears as eth2, and so on.

Evidently the gutsy domU, noticing that eth0 had a different MAC address than the "saved eth0 MAC address", assigns a brand new eth# and saves the MAC address with the new interface number.

Solution:

1. Edit /etc/udev/rules.d/70-persistent-net.rules in the domU.
2. Remove dynamically generated lines.
3. Add:

   SUBSYSTEM=="net", DRIVERS=="vif", ATTRS{nodename}=="device/vif/0", NAME="eth0"

4. Shut down the domU and restart it.

Alternate solution (offered and preferred by Jonathan Addleman):

1. Edit the domU's configuration file (/etc/xen/foo) in dom0.
2. Assign a static MAC address:

   vif  = [ 'ip=1.2.3.4, mac=00:16:11:ab:cd:ef' ]

3. Restart the domU.

Notes:

• Ubuntu feisty dom0
• Xen 3.0.3
• Ubuntu gutsy domU