Double NAT problem on gigabit internet

[willzyx]

Hello,

New to the whole mesh networking and Orbi. Just got a 2-pack Orbi and conencted with Netblazr ISP. There is no modem because of gigabit internet coming from the cat5e outlet, instead of cable. So I just plugged Orbi direct into cat outlet. I am now having Double NAT problems on my Xbox. 

What is the best way to fix it? Is it something I can do with the Orbi to fix it without losing functionality and speed, or is it something I have to contact ISP about? 

Much thanks. 

[guzzijason]

Perhaps check to see if you are in Router or AP mode in the Advanced setup options. AP mode may eliminate the double NAT.

[willzyx]

It's definitely in router mode. Wouldn't setting it to AP mode stop the firewall and other security measures from working? I've heard that it's never recommended. Or since it's showing double nat, does that mean ISP already has that covered? Tried to contact ISP, but it's Saturday.

[guzzijason]

I think the only other option would be to have the ISP put their side into bridge mode, but I'm not familiar with that particular ISP or their capabilities. If they are NAT'ing for you, then additional security on your side might be overkill, but again, I'm just speculating a bit.