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I know that people have gotten it to work, but haven't done it myself, so you may need to tinker a little. Here is the trick - cooperative control typically does not go across your VPN, however you can coax it to do so by statically defining a neighbor. To do this you need to set one AP or Bonjour Gateway on either side of the VPN and set up a static neighbor relationship between the two. This is an advanced and often unnecessary feature that is infrequently used - if you go into the device configuration page and you expand roaming configuration, you can set the remote device as a included neighbor.