is it possible to do 802.1q vlan tagging in a domU?  i have it working fine in the dom0:

  # vconfig add eth0 560 (creates eth0.560 interface)
  # ifconfig eth0.560 10.10.10.140/24 (a subnet on vlan 560)
  # ping 10.10.10.100 (success)

but have been unsuccessful assigning 10.10.10.141 to a domU and getting it to communicate with vlan 560.  i've tried a wide variety of combinations of bridges, vconfigs, and xen domU vif settings, so far nothing has worked.  is it even possible to do what i'm trying to do?  or am i simply missing the secret sauce?

jason