On my Deco AX1500 (Deco X15) I've got 2 Xboxes that I have hooked up to the network.  Both Xboxes are connected to the same network, however one shows Open NAT and the other shows Double NAT.  The one with Double NAT is not allowing me to play multiplayer games, but the other Xbox does fine.  I'm not super tech savvy, but I do my best.  Any information on how I can get both Xboxes to show Open NAT so they can both be used?  Thanks in advance.