We tested this beta NO-NAT functionality . There is an issue, confirmed by Meraki TAC: ICMP does not work , which mens the servers on MPLS are not able to ping the host on LAN . This was considered unnaceptable and the "TRANSIT VLAN to MPLS  " solution was used. The only remark with this solution is that the route 0.0.0.0  0.0.0.0 , by default,  points to the Internet Interface, We had to create routes to private IP ranges (10.0.0.0 /8, for example) to make OUTBOUND traffic flow via the Transit VLAN . The LAN subnets also had to be redirected to transit VLAN on MPLS router for INBOUND traffic    ... View more