Cascade is for if you have a special service provision from AT&t. Possibly static IPs, possibly something else.
IP pass through is what you use for a typical consumer connection where you just want to forward all of the ports directly to your desired router. And I use that and it works fine
I think I remember having to reboot both the AT&t box in my router a couple of times to make the IP pass through really stick. Also, I possibly had to manually assign the Mac address rather than use some sort of auto detections scheme
I would check the logs on the ASUS router to see if any traffic is coming to it.
Cascade is for if you have a special service provision from AT&t. Possibly static IPs, possibly something else.
IP pass through is what you use for a typical consumer connection where you just want to forward all of the ports directly to your desired router. And I use that and it works fine
I think I remember having to reboot both the AT&t box in my router a couple of times to make the IP pass through really stick. Also, I possibly had to manually assign the Mac address rather than use some sort of auto detections scheme
I would check the logs on the ASUS router to see if any traffic is coming to it.