Part of the Furniture
If you go back a few posts the multiple consoles issue was fixed in 380.66, with the extra rules Merlin put in place as side from the global ones. For wan traffic and he switched on a setting.No. Test PC is not in DMZ. Non Gaming device is a VOIP device in the DMZ.
I'll see about loading stock FW later on. As far as I can tell, Port Address Restricted Cone NAT that was reported for both OEM and Merlin FW by the NAT test tool.
Merlin FW seems to be allowing for OPEN NAT with two same games running on both consoles at the same time.