... wow, that was so obvious. I completely forgot about PBR. Image may be NSFW.
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Thanks!
Was already planning on a VTI tunnel, just tested it with a directly-attached ERX at HQ and had no problems getting the tunnel up.
Clik here to view.

Was already planning on a VTI tunnel, just tested it with a directly-attached ERX at HQ and had no problems getting the tunnel up.