So recently on my Xbox One, I saw that my Nat Type was coming "Unavailable".I looked it up online and basically what you have to do is open up Port 3544.So I did that using Port Forwarding on the R1.But still it said "Unavailable" and still told me to open up Port 3544.I do have UPnP enabled.I actually have another router which is my main router where I receive my internet from and I have set up my PPPoE connection.But I use the R1 as the main router and all the devices are connected directly to the R1 and not to the other router.So basically one router fetches the internet and the R1 is connected under that.But all the devices are connected under the R1.I have even done the whole DMZ thing where you have to put the WAN IP into the DMZ of main router.But still my Nat Type is Unavailable and keeps on telling me to open up Port 3544 when I already have done so.Please Help someone!!