Yes, you're correct, it is a double NAT. The latency measured inside is around 9-11ms, so much higher than the 3-4ms measured at the ATT gateway. I am not doi

Yes, you're correct, it is a double NAT. The latency measured inside is around 9-11ms, so much higher than the 3-4ms measured at the ATT gateway. I am not doing any port-forwarding, but I can definitely see it run into all kinds of problems, or require some configuration beyond my simple skills. I'll investigate your comment: The best-of-both-worlds solution here is to have the outer ISP-provided router put your own router into some kind of DMZ, or use a bridge mode if the ISP router provides it. This basically turns your ISP-provided router into a dumber modem, and leaves all NAT and routing to your own hardware.