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[LeeH]

Hi All,

Could anybody help me with my double NAT issue.

This is the first time I've connected my xbox to my current set up, had no issues a year ago with the standard ISP router.

The set up is HG612 Modem > Synology RT2600.  The xbox is in the DMZ.

 :'(

[LeeH]

If I switch the FTTC on and use the LTE as a fail over I get a moderate NAT. 

[meritez]

How have you got double NAT?

The hg612 should be in bridge mode, the rt2600 should be doing the authentication handshake.

Network diagram please 🥺

[LeeH]

I think this is why maybe?

You may find yourself up against a limitation of EE's mobile network. The EE mobile network uses Carrier Grade NAT (CGNAT) resulting in a double NAT, which means that you don't get your own public IP address but share it with other users. So you can't be uniquely id'ed on the Net & therefore your LAN cannot be addressed from outside for unsolicited accesses. This is unlike fixed BB.

But another thread on the EE forum...

Then bang more bad news. EE had a funny NAT type that blocks me from connecting to most multiplayer games. Darn. And a few more hours of troubleshooting I find a way to make sure I'm on ipv4 not 6. And some other tinkering. Boom NAT type 2. PS4 cod? Works. Pc apex legends, world of tanks, and various steam games ? Check. All suddenly work. Great speeds. Only 20 to 40ms ping. Perfect. Couldn't be happier.



The diagram is simple.   WWW>HG612>ROUTER
                                             >Zyxel>

I have made the assumption the HG612 is in bridge but I can remove it tomorrow and check. (somehow)