Thanks, I already tried that and am getting the same problem, my packet captures clearly show that traffic from my internal VLAN's are exiting OK, I can see the NAT taking place, but upon return, the packets aren't being correctly readdressed and routed back to the origin.
I don't suppose you know if the router has a bridge or pass-through mode that can be enabled somehow? That's the way I've handled this in the past.
