Hi there, 

A couple issues/doubts:


First, I interested in buying a new x50 decoder to replace one of my beloved m4, which I think is saturated. 
I want to connect said X50 as the main one, and leave the other M4 as a satellite.
I have a doubt if the WIFI 6 performance is altered by the mix of decoders and technology (wifi 5/6).

Does it affect the X50 performance in any way if I connect it as the main one? 
They work on different bands/frequencies, I don't know if the performance of the x50 DECO is reduced or simply, one transmits in what it knows (wifi 6) and the other in something less, wifi 5.

The other issue:

Regarding portforwarding, I need to connect to a new NAS and I don't know how to open ports (now, with the decos M4).
The NAS is connected to a M4 satellite, wired to the main one, and this main, connected to the operator's router. Router Mode.
In the Deco´s app, I open the port of the device (its ip address and the port to open). 
In the operator's router, I also open the same port, but I don't know what IP I have to put in particular. I put the IP assigned by the ISP to the main router, since the other Satellite deco M4 doesn't seem to have an IP (they are wired together).
But it doesn't work. 

Any help to do it?

Thanks in advance