Hello,
PLease consider above topology, it has a Router, IE-4010 switch and it is performing L2NAT. All the PC connected to it are a part of Same VLAN-20 and PC - A-B-C are translated to some IP in the screenshot. PC D has the IP in the same subnet as the Router. Just want to confirm that will PC - D able to Ping the gateway IP, because we have configured the L2NAT with VLAN-20 Tagged on the Uplink. I aggressively putting my effort to make it work, but not succeeded.