So, over the past couple of days I've been having some serious NAT problems with my Xb1. My gateway information is as follows:
What Country/State/Province do you live in? New Jersey
Modem brand & model number: SMC Networks (brand) SMCD3GNV (model)
Router brand & model number: Same as above
Wired or wireless: Wireless
Things you have tried: Forwarding all Xb1 ports, putting Xb1 in DMZ, enabling UPnP, turned firewall off completely, turned off auto configuration for IPv6 (I wasn't connected via IPv6 previously, just turned it off on a whim) resetting gateway
Is UPnP Enabled? Yes
Do you have a NAT error? If so, what is your NAT type? Moderate/Strict (mostly strict) but it changes from time to time for reasons unknown to myself.
Any Error Codes you encounter: No
Who is your ISP?(Internet Service Provider): Comcast
Basically, I'm lost. I've gone back and forth between thinking it's a gateway issue and thinking its a Microsoft issue. I also started having NAT trouble on my Xbox 360, and tried everything I posted above to attempt to fix it. Nothing worked until I turned off auto config for IPv6 (strange because I'm positive the 360 isn't even compatible with it, but whatever works I guess). Now just having UPnP on is enough to give me an open nat on 360, but I'm still strict/moderate on my One. I would really like to get this issue sorted out, and ideally in a way that allows me to run my XB1 and my 360 at the same and have both NAT's open. Right now when both consoles are on at the same time my 360 has an open NAT while my One has a strict NAT, leading me to believe some Xb1 ports are possibly blocked by my isp. Is this a known issue with Comcast users or something?