I have bought Ubiquiti Edgerouter Lite ERlite-3, and early October I have appointment with computer tech guy to come out to do house call to configure it. I am told he can handle everything except the SPI. Says he has no idea how to set up Stateful Packet Inspection on a Ubiquiti router, and I really want both NAT & SPI, so any tips on how to do it that I can pass on to him? Thank you for any help!