Xbox one has open nat and 360 has moderate

I've spent hours messing around with the settings on my router and managed to get my Xbox one to have an open nat, it used to be strict. But now my 360 has a moderate nat when it used to be open. I've forwarded all the necessary ports for both consoles but
I can't get my 360 to open again. I have a netgear B90-755025-15 router. I've gone through the router and I can't find anything in order to enable UPnP. At this point I feel like I've done everything possible. Any help would be appreciated.

:)

 

Xbox 360 Party keeps disconnecting, games laggy/no connections and disconnect from xbox live

I'm having similar issues. My Xbox One has open NAT and no lag but my 360 is moderate. It doesn't make sense. I think the network adapter firmware on the 360 is buggy.

 

Unable to play MW3 on 2 Xboxes at the same time, in the same house?

Try putting 1 360 in the DMZ. Tis what i had to do, one 360 has open Nat(DMZ), the other is moderate.

 

The Netgear 7550 (B90-7550025-15) doesn't support UPnP (Universal Plug and Play).

UPnP implementation is an essential part, for the process to automatic port forwarding network ports used by Xbox Live, to multiple machines (xboxes), communicate through the same router, Internet connection.

If I may: The Netgear, model: B90-755025-15/Netgear 7550, doesn't support multiple console (Xbox) support. What you can do is to configure this device to be operating in bridge mode (operating as a standard modem without NAT implementation) and buy yourself
a well-behaved router that is known to support multiple console support.

Good luck!