Xbox One Gateway and NAT problems

WAN IP 121.217.145.xxx.

So - this doesn't fall in the ranges for Private IPs in your link. Good news

Thanks Gaz I'll pick this back up when I wake up.

Thanks for replying Taidara.

Just to confirm for you the Belkin AC1800 comes in two forms for lack of a better word. a) Gigabyte router,, and b) Gigabyte modem router (the one I have)

http://i918.photobucket.com/albums/ad21/FalconR6/Mobile%20Uploads/b70ece8d-a902-42a8-9485-312112b8d8f6_zpsb32928d7.jpg?t=1389539177

Questions: The 360 never had any problems with using a combined modem/router. Why the dramas with the X1?

I've looked all over the Belkins help section/manual - no clues given on how to set up a bridge,, any ideas?

Have you heard of the problem of the X1 "forgetting" gateway when turned off (not asleep)?

Snakebit - thanks for the help. It's getting very late where I am - I'll see what I can do with bridging tomorrow.

Taidara -- On the bottom of my router is the model F9K1118 - it does actually just specifies to the router part.. On the box is the model number F9J1107 which refers to the combo of F9K1118 and F9J1000.

Looking more closely, this is how it is setup --> data cable from wall (DSL line) goes to Power Source block which is plugged into mains power. Turns out - Power source block is the modem. Single lead comes out of power source which splits near the end into
a data and power cable - both which go into router. From there, I have an ethernet cable running from one of the LAN ports to the Xbox one.

Sorry about confusions - I'm trying to get my head around it.

I posted a work around for this issue

Let's try to determine whether you are in a double NAT situation. Log in to the web interface of your Belkin router and look at the WAN IP reported there. If it is a private class IP (see explanation at http://whatismyipaddress.com/private-ip), then your
Belkin router is behind another NAT router.