Disable NAT on Gigablast modem

Hello, .I am having extreme issues with multiple PlayStation 4 devices on the same network, especially when playing the same game.  One possible work around I found online was disabling NAT on the modem, however I cannot seem to locate the setting on the interface.

Am I missing it?  Is it not able to be done?  Not paying as much as I am to have it not working.....